Coordinates: 48°12′20.6″N 16°22′2″E / 48.205722°N 16.36722°E / 48.205722; 16.36722 The Herzgruft is the chamber protecting 54 urns containing the hearts of deceased members of the Habsburg dynasty. It is a small room off St. George's Chapel of the Augustinerkirche church located within the Hofburg complex in downtown Vienna, Austria. Herzgruft means "heart crypt" in German.
The first heart (that of King Ferdinand IV of the Romans) was placed in the Augustinerkirche on 10 July 1654, and the last (that of Archduke Franz Karl of Austria) on 8 March 1878.
The bodies of all but three of those whose hearts are here are in the Imperial Crypt a few blocks away.
Read more about Herzgruft: Hearts Inurned Here