Belzec Extermination Camp
When Germany was occupying Poland, they established a sting of concentration camps in southeastern Poland. The headquarters for all these newly formed labor camps was the Belzec camp, named because it was located outside of the city, Belzec.
Belzec was the first camp created for the purpose of killing large numbers of people. It was an extermination camp, and it was located in the south of Poland. It was an important part to the final solution, the nazis plan of genocide. It was the first camp to have stationary gas chambers, before they were in trucks.
It was well hidden from the outside world, surrounded by camp flogged and barbed wire so people wouldn't know what was happening there.
Though the camp wasn't open long, it was still able to kill 600,000 thousand people, 80,000 in just the first month. It opened in November of 1041, and closed in December of 1942. Prisoners there were misled into believing they were just at a transit camp, waiting to be sent somewhere else, but were chased into the gas chambers after they had been separated and their clothes were removed.
Prisoners also had to assist in the digging of mass graves before the bodies were able to be cremated. Other had to clean rail cars.