The first exhibitions of the site took place in 1987, as part of Berlin's 750th anniversary. The cellar of the Gestapo headquarters, where many political prisoners were tortured and executed, was found and excavated. The site was then turned into a memorial and museum, in the open air but protected from the elements by a canopy, detailing the history of repression under the Nazis. The excavation took place in cooperation with East German researchers, and a joint exhibition was shown both at the site and in East Germany in 1989.