The Grafeneck Euthanasia Centre (German: NS-Tötungsanstalt Grafeneck) housed in Grafeneck Castle was one of Nazi Germany's killing centres as part of their forced euthanasia programme. Today, it is a memorial site dedicated to the victims of the state-authorised programme also referred to since as Action T4.At least 10,500 mentally and physically disabled people, predominantly from Bavaria and Baden-Württemberg, were systematically killed during 1940. It was one of the first places in Nazi Germany where people were killed in large numbers in a gas chamber using carbon monoxide. This was actually the beginning of the Euthanasia Programme.Here was also settled the central office of "Charitable Ambulance Transport GmbH" (Gekrat), which was responsible for the transport of T4 and was headed by