Located in Southern Poland outside the tiny town of Oszwieczm, Aushwitz is the German name for the small town.  Auschwitz developed in 3 main phases: the regular camp most are familiar with, the Women's Divsion and Birkenau mostly for men.  The small town, once a haven for Jews became the site of the greatest number of deaths of innocents during the Shoah Jews from all over Poland were deported there and killed.

Birkenau, Auschwitz II was located in Brzezinka 3km from Oswiecim.

Treblinka, not far from Warsaw Poland,  to the central, central northeast, was the killing center to which many of the Warsaw Ghetto Jews were deported.  The Nazis deceived the Warsaw Judenrat into believing it was only a labor camp, demanding groups of several thousand workers.  Leading into Treblinka, was a road paved with Jewish gravestones.  Eichmann described it's intial entrance point as non-descript, looking like a small country train depot.

Located in southeastern Poland in Lublin District. Near village of Belzec Poland. 

Belzec was one of the least detected of the killing centers at the time:  as victims departed trains, they were forced to run through a leafy forest entrance, hiding one of the most mysterious killing centers.  Belzec was known for deaths by gassing and electrocution: the Nazis tried to erase all evidence before the end of the war.

Located near Lublin Poland next to Majdan Tatarski District:

suburb in the "Generalgouvernment"

Served as Concentration and killing Center for men and women, killing center for Resistance Movement & Political Prisoners/dissenters and hospital for Russian collaborators

Brinlitz

Located in the Southern Central Southwestern area of Poland,  not far from Auschwitz

Brinlitz was a labor camp which used many of the "Schindlerjuden" or Schindler Jews.  

Located in Central-South Western Poland.  Prisoners used in Aktion 1005 erasure of Nazi murders. 

Janowska

Located outside of what is now Gdansk, Stutthof is surrounded on the North by the Bay in the Baltic Sea, on the west by the Vistula River and on the right by the Vistula Bay. It's pennisular setting made escape near impossible. The cruel and infamous human soap production was here, as were massive killings in the Sea and death marches.

Located almost due South, near the southern border of Poland not far from Krakow and Auschwitz.  The commandant, Amon Goethe, portrayed in "Schindler's List" was reknown for random sadism, in addition to the killings central to other camps.  Many Schindlerjuden also came from Plaszow to Brinlitz, the more moderate concentration labor camp.

France

Outside of Prague, Czechoslavakia, now the Czech Republic.  Advertised as a 'Retirement Center' for Elderly deportees, many died or were deported to Auschwitz or subcamps such as Buna, or Buna-Furstenberg.

In Holland.  Used as slave labor camp, mostly for women  used in production efforts for nazi war effort.

Yugoslavia.