Pope Francis has arrived at former concentration and extermination camp Auschwitz-Birkenau in Poland.

He is the third Pope to visit the former Nazi camp where 1.1 million Jews and other prisoners where killed.

Visibly moved, the Pope walked under the main gate bearing the inscription "Arbeit Macht Frei" - work sets you free. He later sat in silent prayer.

The Argentine pope met survivors of the camp and lit a candle and prayed in front of a wall where many prisoners were shot.

He sat and prayed in the darken cell of the St. Maximilian Kolbe, a Catholic priest who volunteered to die in place of a stranger..

Pope Francis is on a five-day visit to Poland to mark 1,050 years since the country adopted Christianity.