To truly understand Berlin, you must grapple with modern German history. Sachsenhausen was one of the first concentration camps established by the Nazis, opening in 1936. It served as a model for other camps and became a training center for SS officers. The camp was used to imprison political opponents of the Nazi regime, including communists, socialists, and other dissidents. It also held various other groups that were targeted by the Nazi regime, such as Jews, homosexuals, Romani people, and prisoners of war from various countries. Sachsenhausen has been preserved as a memorial and museum, and it serves as a site of education, remembrance, and reflection on the crimes of the Nazi era.