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Hello and welcome to NewsHour with Rebecca Kesby in London and me, Tim Franks in southern Poland.
I'm at Auschwitz, the concentration camp which became a slave labour camp, which became perhaps the most notorious death factory in human history.
Today has been the 80th anniversary of the liberation of Auschwitz by Soviet troops.
The Nazis murdered almost a million Jews on this site.
Jews were not the only victims here, but they were the overwhelming number in the Nazi campaign to wipe out an entire people.
During that all consuming fire, the Holocaust, 6 million Jews were killed, 40% of the global population.
The enormity of the crime can defy comprehension.
And the legacy of Auschwitz, our understanding of anti Semitism, of genocide, of how we can allow the most terrible crimes still to happen, that remains fiercely contested.
It was for that reason, at the ceremony which took place as this cold winter's day in Poland turned to night, it was the voices of the ever fewer number of survivors, those now in their 80s and 90s, who somehow made it out alive.
It was their voices which predominated.
The visiting dignitaries, the presidents of France, Germany and Ukraine, the King of Britain among them.