Adolph Hitler and the Nazi regime set up networks of concentration camps before and during World War II to carry out a plan of genocide. The children pictured here were held at the Auschwitz concentration camp in Nazi-occupied Poland.

Survivors at the Wobbelin concentration camp in northern Germany were found by the U.S. Ninth Army in May 1945. Here, one man breaks out in tears when he finds he is not leaving with the first group to the hospital.

Survivors at Buchenwald concentration camp are shown in their barracks after liberation by the Allies in April 1945. Elie Wiesel, the Nobel Prize-winning author, is on the second bunk from the bottom, seventh from the left.

Fifteen-year-old Ivan Dudnik was brought to Auschwitz from his home in the Oryol region of Russia by the Nazis. While being rescued, he had reportedly gone insane after witnessing mass horrors.

Allied troops are shown in May 1945 discovering Holocaust victims in a railroad car that did not arrive at its final destination.

A total of 6 million lives were lost as a result of the Holocaust. Here, a pile of human bones and skulls is seen in 1944 at the Majdanek concentration camp in the outskirts of Lublin, Poland. 

A body is seen in a crematory oven in the Buchenwald concentration camp near Weimar, Germany in April 1945.

Auschwitz camp, as seen in April 2015. Nearly 1.3 million people were deported to the camp and more than 1.1 million perished.

Prosthetic legs and crutches are a part of a permanent exhibition in the Auschwitz Museum.

A pile of footwear are also a part of the Auschwitz Museum.