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In 1941 the construction of a second camp, later called Auschwitz II - Birkenau was commenced in the village of Brzezinka 3 kilometres away; and in 1942 the camp in Monowice near Ozwiecim - KL Aushchwitz III - was established on the territory of the German chemical plant IG-Farbenindustrie. Furthermore, during the years 1942-44, about 40 smaller branches of the Auschwitz complex came into being; these fell under the jurisdiction of KL Auschwitz III and were situated mainly in the vicinity of steelworks, mines and factories, where prisoners were exploited as cheap labour.
The camps in Oswiecim (KL Auschwitz I) and in Brzezinka (KL Auschwitz II - Birkenau) are now maintained as museums open to the public.
Pictured here is the rail entrance to Birkenau - the largest killing centre in the Nazi system. All inmates passed under this archway.