Extermination camp
As part of their training, some high-ranked Nazi Party leaders and SS officers were sent to Auschwitz–Birkenau to watch the gassings.  Höss reported that "all were deeply impressed by what they saw ... [but some] ... who had previously spoken most loudly, about the [need] for this extermination, fell silent once they had actually seen the 'final solution of the Jewish problem'."