The National Museum of History of Azerbaijan has been operating since 1920 in the mansion of the well-known oil industrialist and philanthropist Haji Zeynalabdin Tagiyev. In May 1921 the museum received its first visitors. Until 1936 it was called the State Museum of the Azerbaijan SSR and was later renamed the Museum of History of Azerbaijan. The total number of museum items exceeds 300,000. 20 000 of them are exhibited; the rest are kept in scientific storage.