1. Crematorium I: Located in the Auschwitz I main camp, it had three gas chambers and ovens. It was in operation from 1940 to 1943.
2. Crematorium II: Also known as the Birkenau Crematorium, it was situated in the Auschwitz-Birkenau camp. It had four gas chambers and ovens and was the largest crematorium in the complex. Crematorium II was in operation from 1942 to 1944.
3. Crematorium III: Located near Crematorium II, it had two gas chambers and ovens and was in operation from 1942 to 1944.
4. Crematorium IV: An unfinished crematorium located in the Auschwitz-Birkenau camp. Construction began in 1942 but was never completed.
5. Crematorium V: Also located in Auschwitz-Birkenau, it was a small crematorium used to burn the corpses of prisoners who died from disease or starvation. It was in operation from 1943 to 1944.
These crematoria played a central role in the mass extermination of prisoners in the Auschwitz concentration camp complex, and have come to symbolize the horrors of the Holocaust.