Unfortunately you asked more than one question, so I had to edit down to one.
In chapter two of Night, by Elie Wiesel, the Jews (including Elie and his family) have been moved from their homes twice (the large and small ghettos) before being herded into cattle cars on a train. They do not know where, exactly, they are going, and perhaps the most optimistic among them hope they are simply being taken to a safe place to avoid persecution by the Germans. Of course this is not true, and when the train stops at the Czechoslovakian border, they know they are leaving Hungary behind them.
The trip in such cramped and miserable (inhumane) quarters is unbearable, but what they discover once they arrive at their destination is even more unbearable. Elie and the other Jews have arrived at a place called Auschwitz. Today we know this name because of the atrocities associated with it; for these Jews, the name is not as significant as the reality of being at a death camp.
Elie once told Moshe the Beadle, who had tried to warn his fellow Jews of this very thing, that such things were not possible.
I told him that I did not believe that they could burn people in our age, that humanity would never tolerate it....
Obviously when he and the others arrive at Auschwitz, he is forced to believe the unthinkable.