Over 1.1 million people were murdered at Auschwitz, including nearly a million Jews. On the day of liberation 80 years ago, only 7,000 were saved.

Silence pervades the site of Auschwitz-Birkenau today. Sometimes the only sounds are the soft footsteps of visitors, people who come from all over the world to mourn and to learn, and the voices of their guides speaking in hushed tones into microphones trying to explain the ungraspable.