Auschwitz-Birkenau , the largest Nazi concentration camp. By January 1945 around 2 million people had been killed here. Tourist can watch the barracks once crammed with prisoners, the torture and execution sites, the rail-tracks leading straight to the camp, 5 huge gas chamber, crematoria. 

 It is necessary to visit both parts of the camp, Birkenau and Auschwitz, in order to acquire a proper sense of the place that has become the symbol of the Holocaust.