The Sinti and Roma German Culture and Documentation Center was established in Heidelberg in the early 1990s as a memorial to the Sinti and Rum people killed by the National Socialist Party. It was opened after several years of investigation and collection of stories from massacre survivors. The opening was supported by the presence of many survivors from the Rum and Sinti tribes. The museum is the world's first permanent exhibition on the genocide committed by the Nazis against those tribes. The documentation center consists of three levels and covers an area of approximately 700 square metres.