The Gas Chamber Scene
I have to say that out of all of the films I have seen that have shown the horrors of the Holocaust, in this movie, the scene where the young boy goes into the area where the people are being led to the gas chambers, was one of the most horrifying and devastatingly tragic I have ever seen on film. (For those of you who haven't yet seen it, I won't say.)
May their souls be bound in the bond of life.