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.

Holocaust survivors return to Auschwitz on 80th anniversary of liberation Watch live as Holocaust survivors return to Auschwitz in Poland on Monday, 27 January, marking 80 years since the concentration camp was liberated.