Auschwitz also known as Auschwitz-Birkenau, it opened in 1940 and was the largest of the Nazi concentration and death camps. it is located in southern Poland, it severed as a detention center for political prisoners. but it ended up becoming a prison camp for jews to come to and be exterminated.   

http://www.history.com/topics/world-war-ii/auschwitz

people arriving from the train to Auschwitz. these prisoners are from Hungary.

http://www.history.com/topics/world-war-ii/the-holocaust/pictures/holocaust-concentration-camps/arriving-at-auschwitz

The first and oldest was the so-called "main camp," later also known as Auschwitz 1, the number of prisoners fluctuated around 15,000, sometimes rising above 20,000, which was established on the grounds and in the buildings of prewar Polish barracks.

The second part was the Birkenau camp, which held over 90,000 prisoners in 1944 , also known as Auschwitz 2. This was the largest part of the Auschwitz complex. The Nazis began building it in 1941 on the site of the village of Brzezinka, three kilometers from Oswiecim. The Polish civilian population was evicted and their houses confiscated and demolished. The greater part of the apparatus of mass extermination was built in Birkenau and the majority of the victims were murdered here.

http://auschwitz.org/en/history/kl-auschwitz-birkenau/

More than 40 sub-camps, exploiting the prisoners as slave laborers, were founded, mainly at various sorts of German industrial plants and farms, between 1942 and 1944. The largest of them was called Buna Monowitz, with ten thousand prisoners and was opened by the camp administration in 1942 on the grounds of the Buna-Werke synthetic rubber and fuel plant six kilometers from the Auschwitz camp. On November 1943, the Buna sub-camp became the seat of the commandant of the third part of the camp, Auschwitz III, to which some other Auschwitz sub-camps were subordinated.

http://auschwitz.org/en/history/kl-auschwitz-birkenau/

The gas chambers were used to kill prisoners, capos and jews

"Auschwitz Concentration Camp The Gas Chambers Http://www.HolocaustResearchProject.org." Auschwitz Concentration Camp The Gas Chambers Http://www.HolocaustResearchProject.org. N.p., n.d. Web. 07 May 2015.

The purpose of the crematories were to burn the bodies of the dead, mostly of those who were killed in the gas chambers.

N.p., n.d. Web.

https://www.jewishvirtuallibrary.org/jsource/Holocaust/augas.html

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