Shōsōin

The is a Japanese treasure house in the Tōdai-ji temple complex at Nara It is close to the building which houses the Great Buddha ("Diabutsuden").
It is the oldest museum structure in the world.
History.
The earliest objects in the Shōsō-in were put there by Empress Kōmyō (701–760). The collection includes artifacts from the arts and crafts of the Tempyō era. 
The building was built in the with a raised floor .