Buchenwald concentration camp opened on July 15th, 1937. The prisoners population there was about 80,500. It was one of the first and largest concentration camps in Germany. They were the first Nazi camp liberated by US troops, on April 8th, 1945.
Bergen-Belsen
Chelmno was established December 1941. The Camp consisted of two parts, the administration section, barracks and storage for plundered goods; burial and cremation