In the Middle Ages, a network of rock passages was built in the hard sandstone of the castle.
In the summer of 1940 the stone cellar of 52 Obere Schmiedgasse street was renovated for the protection of Nuremberg's artworks from Allied WWII air raids.
The construction regulated heating, ventilation, and drainage; the bunker extended 24 metres down and offered optimal conditions.
Contents included:[1] Since 1994, there has been an organisation called Kunstbunker – forum für zeitgenössische kunst, which organises exhibitions of contemporary art in another Second World War bunker in Nuremberg.
This bunker is located under the construction yard, near the Kunsthalle Nürnberg.