WW2, Romanian, The largest and most notorious nazi extermination camp, He wrote the book to show his experiences to people and how those experiences impacted him as a person and his Jewish faith.
Official definition of 2:
The Auschwitz concentration camp was a complex of over 40 concentration and extermination camps operated by Nazi Germany in occupied Poland during World War II and the Holocaust. It consisted of Auschwitz I, the main camp (Stammlager) in Oświęcim; Auschwitz II-Birkenau, a concentration and extermination camp built with several gas chambers, and many others that don't really apply to your question.
