Crematoria ovens in Buchenwald concentration camp. (May 1945)
These were taken at Buchenwald, which was never a 'death camp'! http://www.buchenwald.de/fotoausstellung/ausstellung_en/
A crematoria oven where the corpses of prisoners were burned in Bergen-Belsen
concentration camp. (April 28, 1945)
Photograph from the National Archives, courtesy of USHMM Photo Archives
Auschwitz I Crematorium
Ill. 2: (top) Schematic drawing of air photo in Ill. 1. One can easily see that the patches on the Morgues I cannot be input hatches: too large, irregular, alignment incorrect for shadows.