Auschwitz II-Birkenau
Auschwitz II, or Auschwitz-Birkenau, about 72 km from Krakow, began being constructed in October 1941. Birkenau, the biggest of the Auschwitz facilities, was divided into ten sections, each separated by electrified barbed-wire fences. After its opening in March 1942, it acted as a center for the extermination of Jewish people. It housed a group of gas chambers and crematoriums. More than 40 smaller facilities, called subcamps, served as slave-labor camps. The majority of victims of the Auschwitz Concentration Camp died in Birkenau.