CLEAN: Interior shots HRH Prince William, the Duke of Cambridge patron of the Imperial War Museum Foundation, speaks to veterans of World War II Ted Cordery and John Harrison and Freddie Knoller who took part in the French Resistance...

Images of the German Nazi extermination camp at Auschwitz Birkenau where more than a million people mostly Jewish were murdered by Nazis during the Second World War (Footage by AFPTV via Getty Images)

Rare drone images of the Nazi German extermination camp Auschwitz Birkenau where more than a million people mostly Jews were massacred during World War II (Footage by AFPTV via Getty Images)

CLEAN: Exterior shots of Holocaust survivor Renee Salt at commemoration ceremony at Auschwitz on 27th January 2020 in Oświęcim, Poland.

David Cameron visits Auschwitz and pays tribute to victims of the Holocaust

David Cameron visits Auschwitz and pays tribute to victims of the Holocaust

CLEAN : Trial of Auschwitz medic 95 halted as anger mounts

German Chancellor Angela Merkel pays tribute to Holocaust victims at the Death Wall in the former German Nazi death camp Auschwitz during her first ever visit as chancellor (Footage by AFPTV via Getty Images)

Images of the German Nazi extermination camp at Auschwitz Birkenau where more than a million people mostly Jewish were murdered by SS soldiers during the Second World War (Footage by AFPTV via Getty Images)

Auschwitz II Birkenau extermination camp on November 15, 2014 in Oswiecim, Poland. Ceremonies marking the 70th anniversary of the liberation of the camp by Soviet soldiers are due to take place on January 27, 2015. Auschwitz was a...

Auschwitz II Birkenau extermination camp on November 15, 2014 in Oswiecim, Poland. Ceremonies marking the 70th anniversary of the liberation of the camp by Soviet soldiers are due to take place on January 27, 2015. Auschwitz was a...

Auschwitz II Birkenau extermination camp on November 15, 2014 in Oswiecim, Poland. Ceremonies marking the 70th anniversary of the liberation of the camp by Soviet soldiers are due to take place on January 27, 2015. Auschwitz was a...

Auschwitz II Birkenau extermination camp on November 15, 2014 in Oswiecim, Poland. Ceremonies marking the 70th anniversary of the liberation of the camp by Soviet soldiers are due to take place on January 27, 2015. Auschwitz was a...

Auschwitz II Birkenau extermination camp on November 15, 2014 in Oswiecim, Poland. Ceremonies marking the 70th anniversary of the liberation of the camp by Soviet soldiers are due to take place on January 27, 2015. Auschwitz was a...

Auschwitz II Birkenau extermination camp on November 15, 2014 in Oswiecim, Poland. Ceremonies marking the 70th anniversary of the liberation of the camp by Soviet soldiers are due to take place on January 27, 2015. Auschwitz was a...

Auschwitz II Birkenau extermination camp on November 15, 2014 in Oswiecim, Poland. Ceremonies marking the 70th anniversary of the liberation of the camp by Soviet soldiers are due to take place on January 27, 2015. Auschwitz was a...

Auschwitz II Birkenau extermination camp on November 15, 2014 in Oswiecim, Poland. Ceremonies marking the 70th anniversary of the liberation of the camp by Soviet soldiers are due to take place on January 27, 2015. Auschwitz was a...

Auschwitz II Birkenau extermination camp on November 15, 2014 in Oswiecim, Poland. Ceremonies marking the 70th anniversary of the liberation of the camp by Soviet soldiers are due to take place on January 27, 2015. Auschwitz was a...

Auschwitz II Birkenau extermination camp on November 15, 2014 in Oswiecim, Poland. Ceremonies marking the 70th anniversary of the liberation of the camp by Soviet soldiers are due to take place on January 27, 2015. Auschwitz was a...

Auschwitz II Birkenau extermination camp on November 15, 2014 in Oswiecim, Poland. Ceremonies marking the 70th anniversary of the liberation of the camp by Soviet soldiers are due to take place on January 27, 2015. Auschwitz was a...

Auschwitz II Birkenau extermination camp on November 15, 2014 in Oswiecim, Poland. Ceremonies marking the 70th anniversary of the liberation of the camp by Soviet soldiers are due to take place on January 27, 2015. Auschwitz was a...

Auschwitz II Birkenau extermination camp on November 15, 2014 in Oswiecim, Poland. Ceremonies marking the 70th anniversary of the liberation of the camp by Soviet soldiers are due to take place on January 27, 2015. Auschwitz was a...

Auschwitz II Birkenau extermination camp on November 15, 2014 in Oswiecim, Poland. Ceremonies marking the 70th anniversary of the liberation of the camp by Soviet soldiers are due to take place on January 27, 2015. Auschwitz was a...

CLEAN : Pope Francis walks alone through horrors of Auschwitz