The solemn commemoration comes amid a worldwide spike in antisemitism and new surveys suggesting basic knowledge of the Holocaust is eroding.

Eighty years after the liberation of Auschwitz, genocide, the persecution of millions of people because of their origin, war and even the possible use of nuclear weapons are once again considered “normal.

Holocaust survivors and world leaders gathered in Poland on Monday to mark the 80th anniversary of the liberation of the Auschwitz-Birkenau death camp, where the Nazi Germans killed more than 1.1 million people during World War II.

Jan. 27 marks the 80th International Holocaust Remembrance Day, which honors the victims of the Holocaust and commemorates the liberation of the Former Nazi German Concentration Camp of Auschwitz.

One man's daring mission to infiltrate Auschwitz revealed its atrocities to the world – this is his story.

Polish President Andrzej Duda remembered the victims of the Nazis at the Auschwitz-Birkenau memorial site, as commemorations got under way on Monday to mark 80 years since the death camp was liberated towards the end of World War II.

Tomorrow marks the 80th anniversary of the liberation of Auschwitz-Birkenau, the Nazi concentration and death camp where more than 1.1 million people were murdered between 1940 and 1945, about 85% of whom were Jews.

Monday's ceremony is widely being treated as the last major observance that any notable number of survivors will be able to attend.

Survivors of Auschwitz are returning to the notorious Nazi concentration camp to mark the 80th anniversary of its liberation by the Red Army. NBC News’ Jay Gray reports from Oświęcim, Poland.

Holocaust survivors and world leaders gathered in Poland on Monday to mark the 80th anniversary of the liberation of the Auschwitz-Birkenau death camp, where Nazi Germany killed more than 1.1 million people during World War II.

Monday's ceremony is widely being treated as the last major observance that any notable number of survivors will be able to attend.

Birkenau, clutching her mother’s hand as they were being pushed by German soldiers and their barking dogs into the largest Nazi death camp. Now 91, Doniecka still remembers the German phrase “schneller,