Imperial Treasury Vienna

The Imperial Treasury, in the oldest part of the Hofburg, holds the secular and ecclesiastical treasures of the Habsburgs across two dozen rooms. Among them are the Imperial Crown of the Holy Roman Empire, the Austrian imperial crown, and the regalia of the Order of the Golden Fleece. An agate bowl once thought to be the Holy Grail and a narwhal tusk long taken for a unicorn's horn are among the curiosities.