The 80th anniversary of the liberation of Auschwitz by Soviet troops is being observed at the site of the former death camp.

It doesn’t do any good for your heart, for your mind, for anything,” said Holocaust survivor Jona Laks, 94, about her return to Nazi Germany’s Auschwitz-Birkenau concentration camp.

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.

Three survivors of the Holocaust, who endured unimaginable horrors during at Auschwitz recount their experiences and the impact it had on their lives.

Monday, marks the 80th anniversary of the liberation of the Auschwitz-Birkenau concentration camp. Federal President Alexander Van der Bellen

The main observances take place at the site in southern Poland where Nazi Germany murdered over a million people

Elderly camp survivors, some wearing striped scarves that recall their prison uniforms, walked to the the Death Wall, where prisoners were executed. Across Europe, officials were pausing to remember.

World leaders will be in Poland Monday to mark Holocaust Memorial Day and the 80thanniversary of the liberation of Nazi Germany’s Auschwitz-Birkenau concentration camp.