Auschwitz concentration camp was a complex of over 40 concentration and extermination camps operated by Nazi Germany in occupied Poland during World War II and the Holocaust. KL Auschwitz was the largest of the German Nazi concentration camps and extermination centers. Over million men, women and children lost their lives. Auschwitz concentration camp (German: Konzentrationslager Auschwitz) was a complex of over 40 concentration and extermination camps operated by Nazi Germany. Auschwitz, also known as Auschwitz-Birkenau, opened in and was the largest of the Nazi concentration and death camps. Auschwitz, Nazi Germany's largest concentration camp and extermination camp. Located near the town of Oswiecim in southern Poland, Auschwitz. Located in German-occupied Poland, Auschwitz consisted of three camps including a killing center. The camps were opened over the course of nearly two years. It was located near Cracow (Krakow), Poland. Three large camps constituted the Auschwitz camp complex: Auschwitz I, Auschwitz II (Birkenau), and Auschwitz III . Auschwitz was originally a Polish army barracks in southern Poland. Nazi Germany invaded and occupied Poland in September , and by May The Auschwitz-Birkenau Museum and Memorial preserves the Nazi extermination camp set up on occupied Polish soil by Germany during World War Two. Can Auschwitz Be Saved? Liberated in , the Nazi concentration camp is one of Eastern Europe's most visited sites—and most fragile.