During the II World War, the castle was home of the Grafeneck Euthanasia Centre  (German: NS-Tötungsanstalt Grafeneck), one of the main Nazi Germany's killing centres part of their Action T4 programme.
In World War II, the castle served as the Grafeneck Euthanasia Centre (German: NS-Tötungsanstalt Grafeneck), a key part of Nazi Germany's Action T4 program and one of its major killing facilities.