OK the coast is clear. Come out of the bunker and we'll reveal the answer to our Geo Quiz.
The bunker now houses the Boros Collection, but it earlier served as a Russian-run prison, a fruit-storage facility in the former East Germany, and a hall for techno music raves.
The German landmark was built during WWII as an air raid shelter in the Reinhardstrasse in Berlin, Germany. Over the years it's been used as a bunker, a Soviet prison, a fruit storage warehouse, a techno nightclub, and now it's a modern art gallery.
R. Jay Magill writes in the German magazine Der Spiegel about the newest chapter in the story of this Nazi bunker.
http://www.sammlung-boros.de