In all, the Nazi regime murdered 6 million Jews from all over Europe, annihilating two-thirds of Europe's Jews and one-third of all Jews worldwide. In 2005, the United Nations designated Jan. 27 as International Holocaust Remembrance Day.

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.

King Charles to visit Auschwitz on 80th anniversary of Nazi camp liberation - Charles will travel to Poland to commemorate milestone with foreign monarchs, presidents, prime ministers and Holocaust survivors,

On Jan. 27, 1945, the Soviet army liberated the Auschwitz network of concentration camps in Poland, freeing some 7,000 survivors.

Silence pervades the site of Auschwitz-Birkenau today. It can feel that time has stood still at the place where Nazi German forces killed 1.1 million people, most of them Jews. There are the barracks which housed prisoners,

Watch as Holocaust survivors returned to Auschwitz in Poland on Monday, 27 January, marking 80 years since the concentration camp was liberated. Holocaust Memorial Day is held yearly on 27 January to commemorate the memory of the six million Jews and other groups who the Nazis murdered in the Holocaust.

When the Red Army liberated the Nazi concentration and extermination camp Auschwitz-Birkenau on January 27, 1945, the soldiers encountered unimaginable horrors, including mass graves, the smoldering remains of gas chambers and prisoners starving to death.

General views of the former Nazi death camp Auschwitz-Birkenau on the 80th anniversary of its liberation. Heads of state and world leaders will gather at the site later to remember those who perished at the hands of the Nazi regime.