Ruins of the massive men's camps (behind the barbed wires) in Auschwitz II (Birkenau)

There were 250 barracks in Auschwitz II and they were modeled after horse stables meant to house 52 horses. Nazis put approximately 800 to 1,000 people in each such barrack and at its peak, up to 200,000 inmates were housed in the Auschwitz II barracks!