People lay down in a pedestrian zone as part of an art project in remembrance of the 528 victims of the "Katzbach" Nazi concentration camp, in Frankfurt, Germany, Mar. 24, 2014. The inmates of the Katzbach concentration camp, a part of the former Adler industrial factory, were forced into a death march to the concentration camps of Buchenwald and Dachau on Mar. 24, 1945. Some 528 victims of Katzbach are buried at Frankfurt's central cemetery.