There were
1. Auschwitz-Birkenau
Location: Poland
Type: Annihilation; forced labor
Usage: 04/1940-01/1945
Closure: Liberation (USSR)
Present: Preserved (Museum)
2. Belzec
Location: Poland
Type: Annihilation
Usage:03/1942-05/1943
Closure: Liquidation
Present: Monument
3. Bergen-Belsen
Location: Germany
Type: Holding Center
Usage: 04/1943
Closure: Liberation (UK)
Present: Graveyard