the last gassing was in December 1944.
The ending of the Nazi camps came where when the USSR liberated them.
Auschwitz-Birkenau (the Auschwitz group of camps).
Poland
no.
Death Camps: Hitler created the camps so he could quietly and efficiently kill the Jewish population. Concentration Camps: Used as a sort of prison by the Nazis for the duration of the war. They imprisoned people who committed "crimes" against the Nazi regime.
Death camps were the Nazi's way to eliminate those who did not fit their mold. In all, there were seven death camps located in Europe.
The Nazi death camps was put into use after the occupation of Poland in 1939. After the Nazis had Jews, poles and other groups of people who were procecuted by the Nazis. Nazis wanted to kill all the Jews and any Non-Aryan Germans, so they decided to establish bunch of Death camps and Extermination camps.
The Schutzstaffel (SS).
The concentration camps wass ran by the Leader of the SS Heinrich Himmler
http://en.wikipedia.org/wiki/Nazi_extermination_camp
All over germany
Your question should really be stated in the past tense, since the Nazi death camps were closed in 1945. In those camps, people were imprisoned, abused, starved, and killed.