of Stasi files. It was the first time East Germans had undertaken such resistance against the Stasi and it instigated the take over of Stasi buildings throughout the country. Dresden (The Bautzner Strasse Memorial in Dresden) - A Stasi remand prison and the Stasi's regional head office in Dresden. It was used as a prison by the Soviet occupying forces from 1945 to 1953, and from 1953 to 1989 by the Stasi. The Stasi held and interrogated between 12,000 and 15,000 people during the time they used the prison. The building was originally a 19th-century paper mill. It was converted into a block of flats in 1933 before being confiscated by the Soviet army in 1945. The Stasi prison and offices were occupied by local citizens on 5 December 1989, during a wave of such takeovers across the country. The museum and memorial site was opened to the public in 1994. Frankfurt-an-der-Oder - A memorial and museum at Collegienstraße 10 in Frankfurt-an-der-Oder, in a building that was used as a detention centre by the Gestapo, the Soviet occupying forces and the Stasi. The building was the Stasi district offices and a remand prison from 1950 until 1969, after which the Volkspolizei used the prison. From 1950 to 1952 it was an execution site where 12 people sentenced to death were executed. The prison closed in 1990. It has been a cultural centre and a memorial to the victims of political tyranny since June 1994, managed by the Museum Viadrina. Gera , a memorial and 'centre of encounter' in Gera in a former remand prison, originally opened in 1874, that was used by the Gestapo from 1933 to 1945, the Soviet occupying forces from 1945 to 1949, and from 1952 to 1989 by the Stasi. The building was also the district offices of the Stasi administration. Between 1952 and 1989 over 2,800 people were held in the prison on political grounds. The memorial site opened with the official name "Die Gedenk- und Begegnungsstätte im Torhaus der politischen Haftanstalt von 1933 bis 1945 und 1945 bis 1989" in November 2005. Halle (Saale) The Roter Ochse (Red Ox) is a museum and memorial site at the prison at Am Kirchtor 20, Halle (Saale). Part of the prison, built 1842, was used by the Stasi from 1950 until 1989, during with time over 9,000 political prisoners were held in the prison. From 1954 it