institutes for cultural preservation in Tokyo and Nara). From October 18, 2022 to December 11, the Tokyo National Museum celebrated its 150 year anniversary by displaying all of its 89 national treasures in a single exhibition for the first time. Facilities Honkan (Japanese Gallery) The houses the museum's main display of Japanese art from prehistory to the late 19th century. It has two floors and a basement with a total floorspace of . It is designed to be fire- and earthquake-resistant. The Honkan is located on the former site of the main hall of the Kaneiji Temple, which was destroyed during the Boshin War. The first Honkan incorporated a brick structure used as the main hall for the first National Industrial Exhibition in 1877. Construction on its replacement began the next year, following plans drawn up by the English architect Josiah Conder. The two-story brick hall incorporated Anglo-Indian architecture, with two green onion domes surmounting the towers flanking the main entrance. It was completed in 1881. This building was ruined by the Great Kanto earthquake of 1923. It was replaced by Jin Watanabe's reinforced-concrete structure in the Imperial Crown Style, with a neoclassical base and Japanese roof. It was completed from 1932 to 1938 at a cost of 7 million yen. It opened on 10 November 1938 with a ceremony attended by Emperor Hirohito. The building was designated an Important Cultural Property of Japan in 2001. The rooms are ordered beginning with the SE corner of the second floor, passing clockwise around the second and first floor, and ending with the SW corner of the first floor. The basement holds another educational space. Heiseikan The hosts regular special exhibitions in the four large galleries on its second floor; the first floor includes the Japanese Archaeology Gallery, another space for temporary exhibits, a spacious lounge and café, an auditorium, and lecture and orientation rooms. The first floor also holds the gallery of major donors to the museum. The Heiseikan was first opened in 1999. Its name reflects the regnal era of its creation, the rule of Emperor Akihito, which lasted from 1989 to 2019. The building was erected to commemorate the wedding of Crown Prince Hiro to Masako Okawa (now Emperor Naruhito and Empress Masako) on 9 June 1993. The Japanese Archaeology Gallery introduces the use of archaeology to date excavated objects and includes a display of various finds from Japanese