Final answer:
Elie Wiesel was horrified by the sight of Auschwitz's crematorium and other extermination facilities upon his arrival.
Step-by-step explanation:
Elie Wiesel’s initial impression upon arriving at Auschwitz from Birkenau was one of horror. Despite surviving the journey from Birkenau to Auschwitz, Elie and the others were not greeted by better conditions or any sign of humanity; instead, they were confronted with the industrial apparatus of death, including the crematorium and gas chambers designed for mass extermination. The sights and knowledge of what these facilities were used for, and the imminent threat to their own lives, would have been terrifying.