A wall-size image at the Dallas Holocaust and Human Rights Museum that shows Jewish prisoners marching. The Nazis killed prisoners during these marches. AP Photo/Tony GutierrezOver seventy-five years ago, the world started to see the horrors of Nazi concentration camps. Shot by photographers Lee Miller, George Rodger and others, and published in Time, the Daily Mirror and other outlets, these pictures showed gaunt figures greeting Allied soldiers, and corpses piled alongside concentration camp b