Introduction to the basement: Building No. 11 was called the "Death Building" in the Auschwitz Concentration Camp. The basement of the building was the prison in the concentration camp. The first and second floors were the SS interrogation room and prisoner waiting room. The bathroom used by prisoners before execution. There is also a side door on the first floor that leads directly to the Death Wall. It is said that dozens or even hundreds of death sentences are often issued in this death building within two to three hours.