When the prisoners arrive at Auschwitz- Birkenau, what do they see that proves Madame Schachter's visions were tragically accurate?in Night

The presence and treatment of Madame Schachter is probably
one of the most haunting images in the narrative.  When Madame Schachter screams about
fire and its presence all around the victims, most of the people in the railroad car try
to silence her with force and through shunning her. Yet, with the arrival into Birkenau,
there is much to prove her right, when it is too late.  The chimneys would be one
element of fire that proves her right.  The crematoriums would be another.  While
standing in line, Eliezer's father holds his son's hand and tells him, "Remember what
Madame Schachter said."  This helps to bring to light how the lines of people were
standing in order to be gassed or burned, confirmation that the fire about which Madame
Schachter was screaming was sadly accurate.