SS chief Heinrich Himmler (front row, left) and Mauthausen commandant Franz Ziereis (second from left) inspect inspect the Wiener Graben quarry during an official tour of the Mauthausen concentration camp. Austria, April 27, 1941.

SS chief Heinrich Himmler (front row, left) and Mauthausen commandant Franz Ziereis (second from left) inspect inspect the Wiener Graben quarry during an official tour of the Mauthausen concentration camp. Austria, April 27, 1941.