Hohenschönhausen prison, Berlin
The Hohenschönhausen prison was a place of horror. Prisoners of the Stasi, East Germany’s Secret Police, were forced to build 60 windowless cells in the basement, which were only equipped with a wooden cot and a bucket. Over 20,000 political prisoners were mentally and physically tortured here. Today it serves as a memorial center, and some of its tour guides were actually held as prisoners here.