The ruins of crematory II at Auschwitz-Birkenau, destroyed by the SS using explosives on January 20, 1945, along with crematory III, just seven days before the death camp was liberated by the Soviets. Crematory IV had been destroyed by inmates during a revolt on October 7, 1944. Crematory V was blown up by the SS on January 26, 1945, as the Soviets were approaching.
(Photo Credit: Main Commission for the Investigation of Nazi War Crimes, courtesy of USHMM Photo Archives)