Brauweiler Abbey Tourist attraction in Pulheim, Germany

After the failed assassination attempt on Hitler in 1944, Konrad Adenauer was imprisoned for a second time as an opponent of the regime. He fell ill and credited Eugen Zander, a former municipal worker in Cologne and communist, with saving his life. Zander, then a section Kapo of a labor camp near Bonn, discovered Adenauer's name on a deportation list to the East and managed to get him admitted to a hospital. Adenauer was subsequently rearrested (as was his wife), but in the absence of any evidence against him, was released from prison at Brauweiler Abbey in November 1944.

Source: Wikipedia