What Was Auschwitz-Birkenau?

What made Auschwitz-Birkenau unique within the Nazi camp system? It was both a site of brutal forced labor and a center for immediate mechanized killing. This massive complex integrated four large-capacity gas chambers and crematoria to kill on an industrial scale. From the testing of Zyklon B to the "selection" process on the ramp, every aspect was a systematic attempt to turn human beings into what survivor Primo Levi called the "walking dead." Watch to break down the history of the site that has become the universal symbol of the Holocaust.