Sachsenhausen ("Saxon's Houses", German pronunciation: [zaksənˈhaʊzən]) or Sachsenhausen-Oranienburg was a Nazi concentration camp in Oranienburg, Germany, used primarily for political prisoners from 1936 to the end of the Third Reich in May 1945. After World War II, when Oranienburg was in the Soviet Occupation Zone, the structure was used as an NKVD special camp until 1950 (See NKVD special camp Nr. 7). The remaining buildings and grounds are now open to the public as a museum.
The camp was established in 1936. It was located 35 kilometres (22 mi) north of Berlin, which gave it a primary position among the German concentration camps: the administrative centre of all concentration camps was located in Oranienburg, and Sachsenhausen became a training centre for Schutzstaffel (SS) officers (who would often be sent to oversee other camps afterwards). Executions took place at Sachsenhausen, especially of Soviet prisoners of war. During the earlier stages of the camp's existence the executions were done in a trench, either by shooting or by hanging. A large task force of prisoners was used from the camp to work in nearby brickworks to meet Albert Speer's vision of rebuilding Berlin. Sachsenhausen was originally not intended as an extermination camp—instead, the systematic murder was conducted in camps to the east. In 1942 large numbers of Jewish inmates were relocated to Auschwitz. However the construction of a gas chamber and ovens by camp-commandant Anton Kaindl in March 1943 facilitated the means to kill larger numbers of prisoners.
The Main gate or Guard Tower "A", with its 8mm Maxim machine gun, the type used by the Germans in the trenches of World War I, housed the offices of the camp administration. On the front entrance gates to Sachsenhausen is the infamous slogan Arbeit Macht Frei ("work makes (you) free"). About 200,000 people passed through Sachsenhausen between 1936 and 1945. Anchoring the base of the triangular shaped thousand-acre site was the large Appellplatz, where tens of thousands of prisoners would line up for morning and evening roll call. Creating a semi circular configuration, were the barracks of custody zone I which fanned out from the base of the Appellplatz.