Empress Kōjun
The is located to the east of the former main donjon of Edo Castle in the Honmaru. This music hall was built in commemoration of the 60th birthday of Empress Kōjun on 6 March 1963. The ferro-concrete building covers a total area of . The hall is octagon-shaped and each of its eight outer walls is decorated with differently designed mosaic tiles. Construction began in August 1964 and was completed in February 1966.