The Nibelung hoard of Vienna: the Habsburg treasures

The Imperial Treasury in Vienna holds the accumulated treasure of the Holy Roman Empire and the Habsburgs, including the Imperial Crown of the 10th century, a bowl once thought to be the Holy Grail, and a narwhal tusk kept for centuries as a unicorn horn. It is one of the greatest assemblages of royal treasure surviving anywhere, and unlike most such hoards it was never scattered. PUBLIC museum, Hofburg, Vienna.