| ■Tokyo National Research
Institute for Cultural Properties |
■Center for Conservation
Science |
| ■Department of Art Research,
Archives and Information Systems |
■Japan Center for
International Cooperation in Conservation |
| ■Department of Intangible
Cultural Heritage |
|
The Japan Centre for International Cooperation in Conservation and Heritage Commission of Saudi Arabia co-organised a workshop for 3D digital documentation at the National Museum of Saudi Arabia from 2nd to 4th November, 2025. As the application of 3D documentation in the field of cultural heritage has been drawing attention in Saudi Arabia in recent years, our workshop series of 3D documentation was organised for the first time in Saudi Arabia, with the theme of “3D Digital documentation of archaeological objects,” receiving 25 experts as participants who are working in fields such as archaeological excavation and museum management.
During the workshop, lectures were held by lecturers despatched from Japan regarding the basic methods of 3D photogrammetry, and various 3D documentation techniques depending on the object size or occasion of the documentation. In addition to the lectures, participants were divided into five groups and practiced the 3D photogrammetry of sample objects and documentation with a Lidar smartphone application and 3D laser scanning.
On 4th November, an open event titled “XR meet up in Riyadh” was held in the National Museum of Saudi Arabia. Various examples and activities from Japan related to 3D digital documentation were exhibited in the event, as follows: ‘VR experience of Copan in Honduras’ by Komatsu University; ‘XR Heijo-kyo’ by the Nara National Research Institute for Cultural Properties, ‘3D DB Viewer project’ by the National Institute of Advanced Industrial Science and Technology and Nara National Research Institute for Cultural Properties; ‘Kyoto VR’ by Holo Lab Inc.; Scaniverse by Niantic Inc.; and VR experience of Aali royal burial mound in Bahrain and Tanei Temple in Cambodia. The event provided opportunities to experience various utilisations of 3D documentation of cultural heritage widely to the public.
This workshop was organized as a part of the project for Exchanges in International Cooperation for Conservation of Cultural Heritage funded by the Agency of Cultural Affairs.
Professor Emeritus SASAKI Tatsuo giving a lecture
On Saturday, November 8, 2025, the Tokyo National Research Institute for Cultural Properties (TOBUNKEN) welcomed Professor Emeritus SASAKI Tatsuo of Kanazawa University as a guest speaker for a lecture titled “Excavating the Archaeological Sites of the Persian Gulf Region.” This event was organized as the seventh session of the “Pioneer Seminars in West Asian Archaeology,” a lecture series launched in 2018 by the Japanese Society for West Asian Archaeology to highlight first-generation researchers who opened new paths in archaeological studies across West Asia and its surrounding regions. Co-hosted with the Society, the seminar was held in a hybrid format—both in-person at the Institute’s seminar room and online—and brought together a total of 90 attendees.
Professor SASAKI, a specialist in the history of inter-civilizational exchange, has focused his scholarly work on the distribution of ceramics while participating in numerous excavations conducted in Japan, and also overseas in Iraq, Egypt, the Indian Ocean, the Persian Gulf, and various desert regions. Despite the often unstable political and security conditions in these areas, he continued his fieldwork, deepened his collaborations with local researchers, and dedicated himself not only to excavation but also to the conservation of archaeological sites.
Drawing from his extensive experience—encountering different research environments and approaches to heritage preservation across countries—Professor SASAKI’s lecture offered valuable insights. It resonated not only with active field researchers, but also with those who have long been inspired by the archaeological and historical world of West Asia, as well as younger generations preparing to enter the field.
Today, at least fiveJapanese-led archaeological missions are operating in the Gulf region. The latest research results, carried forward by the new generation that has inherited the pioneers’ spirit, will be presented in detail at the 33rd Annual Meeting of Excavation in West Asia scheduled for March 21–22, 2026, to be held in the same venue.
Symposium in Tokyo
Symposium in Kyoto
Study Tour: Visiting the Byōdō-in Temple
Due to conflict and prolonged instability, archaeological research and international assistance had been suspended in Iraq for a period of time. In recent years, however, foreign archaeological missions have gradually been returning, and international research on the history of ancient West Asian civilizations, as well as activities for the protection of cultural heritage, have resumed. The Tokyo National Research Institute for Cultural Properties (TOBUNKEN) has continuously provided support to Iraq, including training programs in Japan and the provision of equipment for conservation and restoration specialists of the Iraq National Museum between fiscal years 2004 and 2010, and the organization of two symposia in 2019 and 2022. At present, one of the key challenges in Iraq is to raise awareness among local communities to ensure the sustainability of cultural heritage protection.
In response to this situation, TOBUNKEN, in cooperation with the Japanese-Iraqi Institute for Archaeological Education of Mesopotamia and the Research Center for Japanese Garden and Historical Heritage at Kyoto University of the Arts, invited three specialists from Dhi Qar Governorate in southern Iraq from November 22 to December 1, 2025 to participate in two symposia held in Japan with the core theme of “Local Communities and Cultural Heritage” and a study tour organized to introduce new ideas and approaches through Japanese examples of site management and the utilization of cultural heritage, and to apply these insights to address challenges in Iraq.
At each symposium, the Iraqi specialists presented the current state of archaeological excavations and site management in Dhi Qar Governorate. They also reported on outreach activities related to ancient Mesopotamian civilization and archaeology, events designed to connect museum collections with local communities, and the results of surveys on perceptions of cultural heritage within higher education.
From the Japanese side, at a Tokyo venue, lectures were delivered by Mr. NAKAO Tomoyuki of the Agency for Cultural Affairs and Mr. MIYOSHI Seicho of Hida City on the current status of Japan’s cultural property protection policies and initiatives undertaken by local governments. At a Kyoto venue, a keynote lecture on the site management of Byōdō-in Temple and its collaboration with local communities was given by Prof. NAKA Takahiro of Kyoto University of the Arts. In addition, Mr. YAMADA Takafumi of the World Heritage Office of Nara Prefecture spoke on guidance for municipal officials responsible for World Heritage sites and collaboration with school education, while Prof. USAMI Tomoyuki of Kyoto University of the Arts introduced student- and citizen-participatory support activities, including a web-based GIS mapping of cultural heritage in Iraq. Through these presentations, the characteristics and challenges of public outreach activities in both countries were shared, and active discussions were held on effective strategies for increasing opportunities for citizens to engage with cultural heritage.
During the invitation period, the Iraqi specialists also visited archaeological sites and museums in Tokyo and Kyoto between the two symposia. They were able to bring valuable information relevant to addressing challenges back to Iraq, including the advantages of site museums; methods of site presentation, such as the indication of remains through reconstructed buildings and plantings, and in situ preservation using protective shelters; as well as interpretive approaches employing VR and AR technologies and multilingual video materials.
We hope that the methods and knowledge gained in Japan will contribute to the future advancement of cultural heritage protection in southern Iraq, and we will continue to strengthen our cooperative efforts going forward.
Commemorative photo with trainees, the Latin team, ICCROM representatives, and the Japanese team
Practical training session conducted by the Japanese team
The Tokyo National Research Institute for Cultural Properties (TOBUNKEN) has jointly organized the ‘International Course on Conservation of Japanese Paper in Latin America’ in Mexico City since 2012, together with ICCROM (International Centre for the Study of the Preservation and Restoration of Cultural Property) and CNCPC-INAH (The National Center for Cultural Preservation, The National Institute of Anthropology and History). Compared to North America and Europe, the Latin American region is considered to have fewer opportunities for training and information exchange regarding cultural property conservation and restoration. Therefore, by targeting this region, the training program aims to contribute to the preservation and restoration of paper cultural properties in the region.
The course was held from November 12 to 26, 2025, marking its ninth edition, welcoming a total of nine trainees from six countries: the Argentine Republic, the Plurinational State of Bolivia, the Republic of Chile, the Republic of Colombia, the Republic of Guatemala, and the United Mexican States.
The first half of the training was conducted by the Japanese team of instructors and the second half by the Latin team of instructors from the United Mexican States and the Kingdom of Spain. The first half provided foundational knowledge on Japanese restoration techniques for paper-based cultural properties, including lectures on washi, traditional Japanese paper, and restoration techniques for such materials. Practical sessions focused on highly applicable techniques, tools, and materials.
Participants expressed very high satisfaction with the training. They greatly valued the opportunity to learn directly through hands-on experience with washi and Japanese techniques, and to gain an understanding of the underlying philosophy behind them.
Furthermore, the instructors for the Latin team included Mexican experts who had previously attended the courses, including the ‘International Course on Conservation of Japanese Paper’ at TOBUNKEN, which has been running for over 30 years. This steady capacity building abroad represents a significant achievement for our institute. We hope the techniques, knowledge, and personal connections fostered during this training will further contribute to the preservation of cultural properties both domestically and internationally.
Survey of wall painting condition using a checklist
An example of a wall painting under investigation
Since 2021, The Japan Center for International Cooperation in Conservation has been involved in Joint research on the maintenance, management, and conservation-restoration of mural paintings under the “International Research on Conservation and Restoration Techniques for Cultural Heritage” program.
As part of this initiative, we are collaborating with the Ministry of Culture and Media of Croatia, the Museum of Istrian History and Maritime Heritage, and the University of Zagreb to develop a maintenance management system for wall paintings in churches in the Istrian region, located in the northwest of Croatia. This region is home to numerous mural paintings created from the medieval period to the Renaissance, with over 150 works currently documented. The aim of this research is to investigate and record the state of conservation of these wall paintings, and to share the collected data among experts to help in their maintenance and management.
From November 3 to 7, 2025, we visited sites in the region and conducted a third pilot test using a checklist. In this test, based on the results and issues identified in the previous investigation, we reviewed and refined the checklist items to obtain more accurate assessment results, confirming further improvement in its practicality. The local institutions expressed a deep understanding of and strong interest in this project, along with a strong desire to continue their cooperation in the future. Moving forward, we plan to further develop the collaborative relationships that have been built so far, and, under a more robust research framework, continue our practical efforts toward establishing a sustainable maintenance and management system that will contribute to the conservation and utilization of the wall paintings.
Statue of Saint Zanobi
X-ray imaging of the statue
Since 2021, The Japan Center for International Cooperation in Conservation has been involved in a research survey on stucco decoration and clay statues under the research project “Technology for the Conservation and Restoration of Cultural Heritage” program.
From November 8 to 12, 2025, we visited Florence to conduct research and present our findings on the clay statue groups created by late Renaissance and Mannerist sculptors Pietro Francavilla and Antonio di Annibale Marchissi. These sculptures were originally produced as elements of a temporary façade erected at the Santa Maria del Fiore Cathedral in 1589 to celebrate the wedding of Grand Duke Ferdinando I de’ Medici of Tuscany and Christine of Lorraine. After the temporary structure was dismantled, the works were placed for a time along the nave walls inside the cathedral. In the nineteenth century, they were moved to the attic space on the northeastern side of the cathedral dome, where they remain today under the care of the Opera di Santa Maria del Fiore.
In the recent results briefing, we shared within our research team the findings obtained through the non-destructive investigations conducted to date— including photographic documentation using visible, infrared, and ultraviolet light, X-radiography, fiberscope exploration, and 3D measurements. These investigations enabled us to identify key structural features, such as the multi-layered composition centered on clay and the design based on the modularization of individual components. We also confirmed traces of surface finishes and gilding, providing important clues to the original production processes of the works. Going forward, we plan to gradually shift toward micro-destructive analyses involving limited sampling—conducted under appropriate ethical standards and with full consideration for conservation science— to obtain detailed information that cannot be adequately captured through non-destructive methods alone. Through this approach, we aim to clarify the correlation between the works’ structural characteristics and their deterioration mechanisms, and ultimately contribute to the development of appropriate conservation and restoration strategies.
Furthermore, this study aims to clarify both the universality of stucco decoration and clay statue traditions—elements that have been transmitted across regions and historical periods—and the diversity of their technical developments. As an interdisciplinary endeavor that spans art history, conservation studies, materials science, and cultural heritage studies, the project depends fundamentally on the international exchange of knowledge and collaborative research. Moving forward, we intend to strengthen our partnerships with specialists around the world and deepen interdisciplinary dialogue, thereby advancing our work in a steady and informed manner as we strive to open new frameworks for understanding within the field of cultural heritage research.
UAV surveying on Filaka Island
Participants working on 3D model creation
The Japan Center for International Cooperation in Conservation held a workshop, titled, “Workshop on Unmanned Aerial Vehicle (UAV) Surveying of Archaeological Sites” in Kuwait on October 10-17, 2025, as a part of the Activities for Exchanges in International Cooperation for Conservation of Cultural Heritage sponsored by the Agency of Cultural affairs. This workshop built upon previous workshops conducted in Bahrain and Japan, focusing specifically on large-scale surveying of archaeological sites such as cities and fortresses.
This training program was conducted in collaboration with the National Council for Culture, Arts and Letters (NCCAL), Department of Antiquities and Museums, and Kuwait University. A total of 15 experts from the institutions and the Kuwait National Museum participated. Participants received lectures on UAV, GNSS (Global Navigation Satellite System), and 3D digital documentation techniques, and then worked on creating 3D models of archaeological sites using sample data. Additionally, on Failaka Island in eastern Kuwait, all participants conducted UAV surveys of archaeological sites of the Hellenistic period. Using the captured data, they created 3D models and learned how to utilize the data for studies and how to perform large-scale surveys of archaeological sites.
Not only Kuwait, but other Gulf countries possess numerous cultural heritage sites. However, there is concern over a shortage of personnel to document and preserve this cultural heritage. It is hoped that learning such efficient methods will help resolve some of these challenges.
Practice of 3D photogrammetry at the burial mounds in Janabiyah
The Japan Centre for International Cooperation in Conservation of Tokyo National Research Institute for Cultural Properties (TOBUNKEN) and Bahrain Authority for Culture and Antiquities (BACA) co-organized a workshop for 3D digital documentation at Bahrain National Museum from 28th to 30th October, 2015. This series of workshops was started from a request from BACA, which has been promoting the introduction of 3D digital documentation techniques to the field of conservation of cultural heritage. As previous workshops had been held in Bahrain and Japan, this time the workshop focused on the ‘3D documentation of built heritage’ for intermediate-level practitioners, welcoming 13 experts of cultural heritage, 11 from Bahrain and 2 from UAE.
On the first day of workshop, lectures were held regarding the documentation methods and utilisation examples of 3D digital documentation for built heritage. After the lectures, the participants tried to document a building by themselves using 3D photogrammetry and Lidar on smartphones at the Fakhro House in the World heritage site, the ‘Pearling path.’ On the second day, participants practiced the documentation with 3D laser scanning in the exhibition room of Bahrain National Museum in the morning, and documentation with 3D photogrammetry and RTK-GNSS of the burial mounds in Janabiyah in the afternoon. The third day’s topic was 3D data utilization. The participants learned methods to create contents for an online digital museum utilising the 3D data of the exhibition room of museum that they had documented by themselves on the previous day. They also learned to create 3D models of the burial mounds in Janabiyah with photogrammetry, and published the models on the digital twin platform ‘3D DB viewer,’ which was co-developed by The National Institute of Advanced Industrial Science and Technology and Nara National Research Institute for Cultural Properties.
The participants showed high motivation in applying these technologies in their daily practice in their respective fields of expertise such as archaeology and architecture, and expressed a willingness to learn further advanced methods. We would like to continue organising these opportunities for knowledge sharing in response to their needs.
This workshop was organized as a part of the project for Exchanges in International Cooperation for Conservation of Cultural Heritage funded by the Agency of Cultural affairs.
Practical work in restoration techniques for mounts
Visiting a hand-made paper (Homminoshi) studio
The ‘International Training Course on Conservation of Japanese Paper’ is jointly organized by the Tokyo National Research Institute for Cultural Properties (TOBUNKEN) and the intergovernmental organization ICCROM (International Centre for the Study of the Preservation and Restoration of Cultural Property). The course started in 1992 and has a good reputation. This year, 166 candidates applied and 10 trainees participated in the program from 25 August to 12 September.
Washi, traditional Japanese paper, is made of plant fiber from the kozo, a kind of mulberry tree. Characterized by its long fibers, it is thin yet strong, and its durability and texture that does not damage cultural properties make it an excellent restoration material. It is used for restoration of artworks in various countries.
The program included lectures on protection systems for paper and cultural properties of Japan and practical training in ‘Restoration Techniques for Mounts,’ which is a national designated restoration technique. While participants have already gained experience as paper conservators in their respective workplaces, the workshop provided an opportunity to reinforce appropriate knowledge, including skills of using Japanese tools and materials. Participants’ feedback has been positive and mentioned that they would share their experiences with colleagues and students upon returning home and recommend this training program to others.
This training program also aims to facilitate interaction among trainees themselves, between trainees and Japanese expert instructors, and with manufacturers of restoration materials and tools through field visits. These interactions are not only a benefit for participants but also an opportunity to motivate Japanese experts and manufacturers of tools and materials. We also intend to continue organizing future training programs with the aim of serving as a bridge between experts and manufacturers, who are experts in Japan and overseas engaging in conservation and restoration of cultural properties, and manufacturers of tools and materials for restoration of cultural properties.
Cleaning test at the Somma Vesuviana archaeological site
Survey of stucco decorations in the storage facility of the Selinunte Archaeological Park
Since 2021, the Japan Center for International Cooperation in Conservation (JCIC) has been involved in a research survey on stucco decoration and clay statues under the research project “Technology for the Conservation and Restoration of Cultural Heritage” program.
As part of this research, a team from JCIC visited Italy from September 8 to 26, 2025, to study archaeological sites of the Greek and Roman periods, including the Roman ruins of Somma Vesuviana, the Pompeii Archaeological Park, and the Selinunte Archaeological Park.
At the Somma Vesuviana site, we focused on a Roman-era decorated gateway excavated by a team led by the University of Tokyo. Based on a research plan prepared in the previous fiscal year, we conducted studies on the techniques and materials of the stucco decorations present at the site, and carried out various experiments on modern conservation and restoration methods.
Meanwhile, at the Selinunte Archaeological Park in Sicily, a meeting was held with the Director of the park to present and explain the objectives and significance of this research. As a result of the Director’s understanding and approval, official consent was obtained to include the park’s Greek-period stucco decorations as research subjects, and full cooperation was kindly extended to our study. Furthermore, since physical and chemical deterioration has been observed in the limestone used for the temples, the park expressed an interest in having us conduct research on possible measures to mitigate such deterioration.
In addition, the Soprintendenza di Palermo (Superintendence of Cultural and Environmental Heritage of Palermo), after reviewing and expressing its understanding of the aims of this project, kindly proposed that we also consider including Roman archaeological sites under its jurisdiction in the Palermo area as potential research subjects.
In summary, through the present field mission, it was confirmed that understanding and support for the objectives of this study are steadily expanding among relevant institutions. Moving forward, we plan to continue comparative research on the techniques and materials of stucco decorations from the Greek and Roman periods—focusing on the sites visited during this mission—to deepen our understanding of their structure and characteristics, while also advancing research on appropriate methods for conservation-restoration and site management.
UNESCO Headquarters: Venue of the 47th session of the World Heritage Committee
A scene from the deliberations in Salle I (main hall) during the session
The Tokyo National Research Institute for Cultural Properties (TOBUNKEN) dispatched three staff members to participate in the 47th session of the World Heritage Committee, held at UNESCO Headquarters in Paris from July 6 to 16, 2025. This year’s committee session was originally planned to be held in Bulgaria, which had been appointed to the presidency. However, the venue was changed during the preparation process due to security concerns.
Although the session usually proceeds smoothly, this time it began in an unusually chaotic manner, due to a proposal requested by the delegation of Türkiye for the exclusion of the NGO “Save the Tigris Foundation” as an observer and the addition of an agenda item to discuss Japan’s response to the World Heritage Committee’s decision at its 39th Session regarding the “Sites of Japan’s Meiji Industrial Revolution” requested by the delegation of the Republic of Korea. The proposal to add the agenda item was finally rejected by secret ballot among the Committee members, as consensus could not be reached despite exhaustive discussions that exceeded the scheduled time. On the other hand, the proposal to exclude the NGO from observer status was approved with minimal discussion, prompting widespread concern and objection from State Parties regarding how the Committee members handled the matter.
In the review of the state of conservation of inscribed properties, 248 sites were discussed, including 56 listed as “World Heritage in Danger,” and 3 sites were successfully removed from the Danger List. Recently, an increasing number of properties remaining on the Danger List for extended periods has been recognized by the Committee as a serious concern. State Parties are strongly encouraged to make greater efforts to improve the conditions of these sites. In the establishment of the World Heritage List, 31 sites were discussed, and 26 sites were newly inscribed. A continuing trend of the Committee to overturn the evaluations of the Advisory Bodies has been noted, as evidenced by the fact that only 16 sites received a recommendation for inscription from the Advisory Bodies. However, some progress can be seen in bridging the gap between the evaluations of the Advisory Bodies and the perspectives of State Parties, as many properties have been inscribed with revised nominations that incorporate recommendations to improve their conservation status. As a result of this session, 170 out of 196 State Parties now have properties inscribed on the World Heritage List, with Sierra Leone and Guinea-Bissau joining for the first time. The uneven regional distribution of inscribed properties has been a long-standing issue for the Committee, as it undermines the representativeness of the World Heritage List. Efforts to correct systemic imbalances have been undertaken, including an updated and in-depth gap analysis conducted by the Advisory Bodies.
In addition, after discussions involving both supporting and opposing views, the outcome of the International Conference on Heritage Authenticity in Africa, held in Nairobi last May with support from the Japanese Funds-in-Trust for the Capacity-Building of Human Resources, was ultimately adopted by the Committee. This is expected to mark a turning point in the revision of value evaluation criteria within the World Heritage system.
The next session of the World Heritage Committee will be held in Busan, Korea, in July next year. TOBUNKEN will continue to monitor developments related to World Heritage and will actively collect and share a wide range of information.
The wall painting before and after cleaning
Scene of the work in progress
The apse after cleaning
The Japan Center for International Cooperation in Cultural Heritage is conducting a joint research project on the conservation and restoration of mural paintings on the interior walls of St. Michael’s Church (Keşlik Monastery) in Cappadocia, Turkey, in cooperation with domestic and international experts and academic institutions.
From June 21 to July 15, 2025, an on-site investigation was conducted in accordance with a conservation and restoration plan formulated based on the findings of the previous year’s field study. The work focused on cleaning the apse area of the church and reinforcing deteriorated plaster layers in the nave that were at risk of detachment. The wall paintings in this church had been obscured by a thick layer of soot for over a century, and no one in recent times had seen their full imagery. Through the careful and safe removal of these long-accumulated deposits during the recent cleaning process, the original colors and fine details of the paintings have been vividly revealed. This has enabled a more detailed examination of the initial iconographic design and painting techniques, yielding new insights into the chronology and stylistic characteristics of the works. Of particular significance is the fact that the practicality of the technical approach taken to the conservation and restoration, systematically developed through this research, was validated during the actual intervention. This constitutes a highly meaningful outcome, both academically and in terms of conservation practice.
This joint research project is an international conservation and restoration initiative led by the Tokyo National Research Institute for Cultural Properties, in collaboration with specialized institutions and universities both within and outside of Turkey. In the current phase of the project, scientific conservation methods and three-dimensional measurement technologies were introduced with the aim of assessing the condition of the wall paintings during the conservation and restoration process. By examining the subject from multiple scientific and physical perspectives, the project seeks to establish conservation and restoration methods that are closely aligned with the specific characteristics of the wall paintings. This multifaceted and meticulous approach has been highly regarded as a pioneering case without precedent even within Turkey and has drawn significant attention. Moving forward, we aim to continue these meaningful activities in response to such expectations, contributing to the conservation and sustainable use of cultural heritage.
Situation of the scattered stones around the Cruciform Terrace (in December 2024)
Excavation for locating the scattered stones
In a previous article, we reported on our preliminary survey to examine conservation and restoration procedures for the Cruciform Terrace in front of the Central Complex at Ta Nei Temple. Subsequently, following discussions with the Authority for the Protection and Management of Angkor and the Region of Siem Reap (APSARA National Authority), it was decided to carry out a more extensive survey of scattered stone components to facilitate recovery of those buried in the sedimentary soil around the collapsed terrace.
In late May 2025, archaeological staff from the APSARA National Authority started excavation in advance, and from June 1 to 22, two staff members from the Japan Center for International Cooperation in Conservation were dispatched to cooperatively check and record the scattered stone components .
As a result, additional terrace components were identified, and the upper bodies and hands of several statues of Avalokitesvara were discovered. However, many of the components of the middle layers of the side wall on the south side of the terrace are still missing, which suggests that this terrace may have been somehow destroyed, for example, by its masonry stones being used as building material for another temple building, and that the materials are likely to have been removed and relocated. To examine the restoration of the terrace composition, including the lost materials, it is necessary to refer to terrace-like structures at other temples of the same period, and therefore a comparative survey was carried out at a total of seven temples during this time.
On June 12, ad hoc experts responsible for providing technical recommendations on various restoration projects at the Angkor Monuments visited our excavation site. Following this, at a Technical Session of the International Coordinating Committee for the Safeguarding and Development of the Historic Sites of Angkor and Sambor Prei Kuk (ICC-Angkor/Sambor Prei Kuk) held on June 19-20, we proposed a basic policy for the restoration of the Cruciform Terrace, and received approval from the Committee to start the work to study the implementation plan.
Survey on the façade elements of historic houses in Kirtipur
Kirtipur, located in the southwest of Kathmandu Valley in Nepal, is on the Tentative Lists of World Heritage Sites as the “Medieval historic settlement of Kirtipur.” However, due to rapid urbanization and damage caused by the Gorkha earthquake in 2015, the historic townscape of Kirtipur has been changing; notably, the number of privately owned historic houses has been decreasing, the degree of which has not yet been ascertained.
The Tokyo National Research Institute for Cultural Properties (TOBUNKEN) and the Kirtipur Municipal Government have been taking inventory of historic houses in Old Kirtipur, along with a pilot case study of preservation of a historic house.（https://www.tobunken.go.jp/materials/ekatudo/2385501.html）
During a mission that took place from May 23 to 31, 2025, TOBUNKEN staff, a Kirtipur Municipal Engineer, and a Nepalese expert conducted a survey for the inventory of historic houses, including a study on the façade elements of those houses. While 137 houses were listed in the previous survey, conducted in July of last year, this time we added more cases, bringing the total number of candidate houses to 164. Studies of the façade elements of all candidates revealed the features of the historic houses and layers of time that span the unique history of Old Kirtipur.
The collected data will be analyzed, including discussions regarding the materials involved in the construction, to clarify the criteria for what constitutes a “Historic House of Kirtipur.” This inventory of historic houses is expected to be not only useful as a record of historic houses in Kiritpur, but also as basic data for creating a regulatory framework to support the preservation of historic houses in Kiritpur.
Dr. Hisham Elleithy
Prof. Miroslav Bárta
On Saturday, May 10, 2025, the Tokyo National Research Institute for Cultural Properties (TOBUNKEN) held a symposium entitled “Archaeology and International Cooperation in Egypt.” This symposium is part of an annual series that has been held since 2021, each year focusing on a different region. It aims to promote the protection of cultural heritage through the sharing of archaeological research results, as well as reports on collaborative projects such as site conservation and capacity building.
This year’s symposium focused on Egypt and was structured in two parts: keynote lectures by invited researchers from Egypt and from the Czech Republic; and project reports from various sites of Japan’s international cooperation efforts in Egypt.
First of all, we were honored to receive a welcome address from Prof. Sakuji Yoshimura, President of Higashi-Nippon International University and a pioneering figure in Japanese Egyptology.
In Session I, Dr. Hisham Elleithy of the Supreme Council of Antiquities, Ministry of Tourism and Antiquities, Egypt, delivered a keynote lecture entitled “Recent and Ongoing International Joint Projects for the Egyptian Antiquities.” He presented archival work related to the Nubian Monuments Salvage Campaign, collaborative site management projects with France, South Korea, and Germany, and recent excavation achievements. This was followed by a lecture by Prof. Miroslav Bárta of the Czech Institute of Egyptology, Charles University, entitled “Cooperation on the Pyramid Fields: Abusir and Saqqara.” He presented an overview of the history of excavations conducted by the Czech team at the Abusir necropolis and introduced an ongoing re-excavation project at the so-called “Mariette Cemetery” in North Saqqara—originally explored by a French director of antiquities in the late 19th century but only fragmentarily published.
In Session II, the respective work and results of eight Japanese projects covering archaeological excavations, conservation, and capacity-building in Egypt were presented, entitled as follows:
“Conservation and Reconstruction of the Second Boat of Khufu” (Prof. KUROKOCHI Hiromasa; Ms. YAMADA Ayano)
“Wall Painting Conservation of the Mastaba Tomb of Idout” (Ms. SUITA Mariko)
“Excavation Project at North Saqqara” (Prog. Dr. KAWAI Nozomu)
“Excavation at Al-Khokha on the West Bank of Luxor” (Prof. Emeritus KONDO Jiro)
“Conservation of the Wall Paintings in the Royal Tomb of Amenhotep III” (Prof. NISHISAKA Akiko)
“GEM-CC (Grand Egyptian Museum Conservation Center) and GEM-JC (Joint Conservation) Projects” (Prof. TANIGUCHI Yoko)
“Excavation at Akoris” (Dr. HANASAKA Tetsu)
“Excavation at Kom al-Dibaʾ” (Prof. HASEGAWA So)
The symposium drew a significant number of researchers and graduate students, providing a valuable opportunity to reaffirm the importance of deepening archaeological knowledge through international collaboration. It also offered new prospects for academic contributions to cultural heritage preservation. Moreover, the event proved to be particularly meaningful by enabling participants to present their ongoing activities together with diverse Japanese projects beyond their institutional or team affiliations in one forum. The invited foreign experts also appreciated the opportunity to gain a comprehensive overview of the contributions being made by Japanese scholars in Egypt.
Investigation of artwork in the Museum of Art and Design Hamburg (Museum für Kunst und Gewerbe Hamburg)
Although many artworks produced in Japan are housed in institutions overseas—particularly in Europe and North America—there are only a limited number of specialists abroad who are well-versed in their conservation and restoration. As a result, when such works are undergoing deterioration or have sustained damage, it is often difficult to carry out restoration at the appropriate time and using suitable methods. Consequently, these artworks may not only become unavailable for exhibition or educational use, but also risk further deterioration.
In response to this situation, the cooperative program offers support for the conservation and restoration of Japanese artworks housed in museums, art galleries, and libraries overseas, either by bringing the artworks to Japan for restoration or by providing expert conservation advice.
Between May 26 and 29, 2025, a detailed investigation of the current condition of the work The Moon and Autumn Plants, a two-panel folding screen by IKEDA Koson, was conducted at the Museum of Art and Design Hamburg (Museum für Kunst und Gewerbe Hamburg). The museum had expressed concern regarding the condition of the work, which has not been exhibited in recent years.
The investigation revealed various forms of deterioration and damage, including flaking and loss of pigments, as well as weakening of the underlying support and lining paper. These findings confirmed that the artwork is in urgent need of conservation treatment. Additionally, it was found that the screen had undergone one or more previous disassembling restorations. During those treatments, the backing paper (karakami) and the wooden frame were reassembled in positions and orientations that differed from their original state.
Meanwhile, in the previous fiscal year, we conducted investigations and provided on-site conservation advice at the Baur Foundation, Museum of Far Eastern Art (Switzerland), the Museum Rietberg (Switzerland), and the National Museum in Poznań (Poland). Based on the findings of these investigations, preparations are currently underway to begin the restoration in Japan on the Emperor’s Visit, an eight-panel folding screen from the collection of the Museum Rietberg.
Survey of a house in Zhemgang province
Stone masonry house in Gasa province in northwest
Since 2012, the Tokyo National Research Institute for Cultural Properties (TOBUNKEN) has been continuously engaged in research on vernacular houses in Bhutan, in collaboration with the Department of Culture and Dzongkha Development (DCDD), Ministry of Home Affairs, Royal Government of Bhutan. The DCDD promotes a policy of preserving and utilizing vernacular houses by integrating them into the legal protecting framework of cultural heritage, while TOBUNKEN supports the initiative from academic and technical aspects. During a survey mission from May 13 to 23, 2025, two staff members of TOBUNKEN, one external expert from Japan, and two DCDD officials carried out the survey of traditional houses in middle, southern, and northwestern Bhutan.
Based on location information collected in advance by the DCDD, we surveyed three stone houses, one rammed earth house, and a bamboo house with post and beam structure in Zhemgang province in the south; three rammed earth houses and six stone houses in Trongsa province in the middle area; and two stone houses in Gasa province in the northwest. Among these, some upper-class houses were found to have extremely thick and substantial stone masonry walls.
As an overview of the traditional houses in Bhutan, rammed earth structures are dominant in the western area where the capital Thimphu is located, while stone masonry structures are so in the eastern and higher northern area. The previous joint surveys revealed that the border between the areas in which these two construction methods are applied is situated around Bumthang province in the middle of Bhutan. The survey conducted on this mission confirmed the architectural features of stone masonry houses in the south and northwest area of Bhutan and clarified a part of the border area of rammed earth house distribution, which is centered on the western area. It could be considered that the differences in construction methods are defined by the various local conditions, such as geographical features, natural resources, material supplies, availability of craftsmen, or by family status, social position, and so on. Further investigation into the distribution and coexistence of these two construction methods is expected to provide additional clues to understand the transition and transmission of the architectural methods of houses in Bhutan.
The surveys were conducted with the support of a JSPS Grant-in-Aid for Scientific Research (B) “Vernacular Stone Masonry Houses of Bhutan: A Study on the Architectural Characteristics and the Suitable Approach for Protection as Cultural Heritage” (Principal Researcher: TOMODA Masahiko).
His Excellency Shaikh Khalifa bin Ahmed Al Khalifa at the event
Lecturers of the symposium
The Osaka-Kansai Expo 2025 started in April, and the Kingdom of Bahrain is hosting a pavilion at the Expo. His Excellency Shaikh Khalifa bin Ahmed Al Khalifa, President of the Bahrain Authority for Culture and Antiquities (BACA), who is in charge of the pavilion, came to Japan to attend the opening ceremony of the expo.
The Tokyo National Research Institute for Cultural Properties (TOBUNKEN) has been undertaking various projects aiming to preserve the cultural heritage in Bahrain for many years. Following a request by H. E. Shaikh Khalifa bin Ahmed Al Khalifa, the institute held the symposium and experience event, “The History and Culture in Bahrain” jointly with BACA on April 20th in 2025.
Japanese and Bahraini archaeologists and Marikofun, Kofun performer, delivered lectures and participants also enjoyed presentations on the history and culture of Bahrain through various XR contents such as VR experience of Bahraini archaeological sites using VR goggles.
Investigation of the condition of wall paintings in a church using a checklist
Example of a wall painting under investigation
Since 2021, The Japan Center for International Cooperation in Conservation has been involved in Joint research on the maintenance, management, and conservation-restoration of mural paintings under the “International Research on Conservation and Restoration Techniques for Cultural Heritage” program.
As part of this initiative, we are collaborating with the Ministry of Culture and Media of Croatia, the Museum of Istrian History and Maritime Heritage, and the University of Zagreb to develop a maintenance management system for wall paintings in churches in the Istrian region, located in the northwest of Croatia. This region is home to numerous mural paintings created from the medieval period to the Renaissance, with over 150 works currently documented. The aim of this research is to investigate and record the state of conservation of thesewall paintings, and to share the collected data among experts to help in their maintenance and management.
From March 10 to 14, 2025, we conducted a pilot test on site at 12 churches using the checklist on the state of conservation prepared in the previous survey. The checklist was structured based on three main focal points: the building in which the wall paintings were painted, the techniques and materials used for the wall paintings, and the state of conservation. Through the test, we were able to review the checklist items and evolve the checklist into something more practical and effective. We plan to continue implementation testing with the goal of building a digital archive.
Research at the Tubli cemetery
Tombstones in Al-Qadem cemetery preserved by the local community
The Tokyo National Research Institute for Cultural Properties has been cooperating on excavation surveys and maintenance of historical sites in the tombs of Bahrain for many years. Although historical Islamic tombstones remain in mosques and cemeteries throughout the country, and about 150 tombstones can still be found in the country today, many are deteriorating due to salt damage.
In response to Bahrain’s request for help in protecting those tombstones, in 2023 and 2024, we conducted photogrammetric surveying using SfM-MVS (Structure-from-Motion/Multi-View-Stereo), a technology for creating 3D models from photographs. So far, we have completed 3D measurements of approximately 100 tombstones located in museums and modern cemeteries. The models created were published on Sketchfab, a platform widely accessible both domestically and internationally, and are being used as a database of tombstones.
A 3D measurement survey was conducted from February 8 to 12, 2025, covering cemeteries in the southern part of the country. Photogrammetric surveying was conducted and measurements were completed as in the past, this time for a total of 29 cemeteries: 2 in Tubri, 1 in Salamya Mosque, 12 in Hoora, 1 in Mahooz, 1 in Daih, 5 in Noaim, 2 in Al-Qadem, and 5 in Karranah. With the exception of buried and destroyed tombstones, this survey completed the measurement of all the tombstones in Bahrain.
This is the first database of 3D models of more than 100 tombstones with information on the dimensions, shape, and inscriptions of each individual monument, and it is highly expected that the results of this survey will be useful for future research on Islamic tombstones, in addition to preserving a record of their shapes.
