Victims of Stasi persecution often ended up in this grim remand prison, now a memorial site officially called Gedenkstätte Hohenschönhausen. Tours reveal the full extent of the terror and cruelty perpetrated upon thousands of suspected regime opponents, many utterly innocent. There's also an exhibit about the history of the prison. To get here, take tram M5 from Alexanderplatz to Freienwalder Strasse, then walk 10 minutes along Freienwalder Strasse.