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Pope Francis says goodbye from the window of the residence of Krakow bishops, where he stayed during his visit to southern Poland, on Sunday, July 30,...

Nuns and clergy celebrate the arrival of Pope Francis during the final mass of his week-long tour at Campus Misericordiae (Field of Mercy) on July 31,...

A nun and clergyman celebrat the arrival of Pope Francis during the final mass of his week-long tour at Campus Misericordiae (Field of Mercy) on July...

This handout picture released by L'Osservatore Romano shows Pope Francis (L) shaking hands with a clergyman during a blessing ceremony of new houses f...

Pope Francis speaks to journalists during a press conference on the plane after his visit to Krakow for the World Youth Days, on July 31, 2016. Pope F...

Pope Francis speaks to journalists during a press conference on the plane after his visit to Krakow for the World Youth Days, on July 31, 2016. Pope F...

Pope Francis blesses faithful as he arrives at the Sanctuary of the Divine Mercy in Krakow, Poland, Saturday, July 30, 2016. (AP Photo/Gregorio Borgia...

Pope Francis greets faithful during a visit to the Divine Mercy Sanctuary in Krakow, Poland, Saturday, July 30, 2016. (L'Osservatore Romano/Pool Photo...

Pope Francis confesses a youth at the Divine Mercy Sanctuary in Krakow, Poland, Saturday, July 30, 2016. (L'Osservatore Romano/Pool Photo via AP)

Pope Francis speaks with nuns during a visit at the Sanctuary of Divine Mercy in Krakow on July 30, 2016 in Krakow-Lagiewniki as part of the World You...

Pope Francis greets pelegrims at the Sanctuary of Divine Mercy on July 30, 2016 in Krakow-Lagiewniki as part of the World Youth Days (WYD). Pope Franc...

This handout released by Osservatore Romano shows Pope Francis confesseing a youth at the Divine Mercy Sanctuary on July 30, 2016 in Krakow-Lagiewniki...

This handout picture released by the Vatican press office shows Pope Francis meeting for lunch with 12 youth representatives on July 30, 2016 in Krako...

This handout picture released by the Vatican press office shows Pope Francis meeting for lunch with youth representatives on July 30, 2016 in Krakow,...

This handout picture released by the Vatican press office shows Pope Francis meeting for lunch with 12 youth representatives on July 30, 2016 in Krako...

This handout picture released by the Vatican press office shows Pope Francis posing for a selfie with youth representatives, after a lunch meeting, on...

Pope Francis passes the Door of Mercy with youth representatives at Campus Misericordiae on July 30, 2016 in Brzegi as part of the World Youth Days (W...

Pope Francis and young representatives of every continent pass the Door of Mercy on July 30, 2016 on the Campus Misericordiae in Brzegi, Poland, ahead...

Pope Francis and young representatives of every continent pass the Door of Mercy on July 30, 2016 on the Campus Misericordiae in Brzegi, Poland, ahead...

Pope Francis walks through the gate of the former Nazi German death camp of Auschwitz in Oswiecim, Poland, Friday, July 29, 2016. Pope Francis paid a...

Pope Francis blesses a child during his visit to the University Children's Hospital in Prokocim, Poland, Friday, July 29, 2016. The visit to the Unive...

Pope Francis leaves the former Nazi death camp of Auschwitz in Oswiecim on 29 July, 2016. Pope Francis visits the Auschwitz-Birkenau WWII-era Nazi Ger...

Pope Francis leads the Way of the Cross on July 29, 2016 at Blonia Park in Krakow as part of his visit to the World Youth Days (WYD). Pope Francis is...

Pope Francis gives a speech at the University Children Hospital on July 29, 2016 in Krakow-Prokocim as part of Pope's visit to the World Youth Days (W...

Pope Francis meets disabled children at the University Children Hospital on July 29, 2016 in Krakow-Prokocim as part of Pope's visit to the World Yout...

Pope Francis meets disabled children at the University Children Hospital on July 29, 2016 in Krakow-Prokocim as part of Pope's visit to the World Yout...

Pope Francis leads the Via Crucis (Way of the Cross) procession on July 29, 2016 at Blonia Park in Krakow as part of his visit during the World Youth...

Pope Francis blesses a man during his tram journey to Krakow's Jordan Park, Poland, Thursday, July 28, 2016 during the World Youth Days. The Pope is o...

Pope Francis kisses a girl during his tram journey to Krakow's Jordan Park, Poland, Thursday, July 28, 2016 during the World Youth Days. The Pope is o...

Pope Francis blesses a girl during his tram journey to Krakow's Jordan Park, Poland, Thursday, July 28, 2016 during the World Youth Days. The Pope is...

Faithful participating in World Youth Days cheer as a tram carrying Pope Francis pulls up in Krakow's Jordan Park, Poland, Thursday, July 28, 2016. Th...

Security guards surround Pope Francis on his pope-mobile as he waves to faithful participating in the World Youth Days in Krakow's Jordan Park, Poland...

Faithful participating in World Youth Days wait for the arrival of Pope Francis at Jordan Park in Krakow, Poland,Thursday, July 28, 2016. (AP Photo/Gr...

Faithful participating in World Youth Days cheer as a tram carrying Pope Francis pulls up in Krakow's Jordan Park, Poland, Thursday, July 28, 2016. Th...

Faithful participating in the World Youth Days greet Pope Francis as he rides in his pope-mobile in Krakow, Poland, Thursday, July 28, 2016. The Pope...

Pope Francis waves to faithfuls as he rides a tram to Blonia Park on July 28, 2016 in Krakow to open the World Youth Days (WYD). Pope Francis became t...

Pope Francis rides aboard a city tram to Blonia Park on July 28, 2016 in Krakow to open the World Youth Days (WYD). Pope Francis became the first pont...

Pope Francis speaks to faithfuls from the Papal window on July 28, 2016 in Krakow as part of his visit to the World Youth Days (WYD). Pope Francis hea...

Pope Francis speaks to faithfuls from the Papal window on July 28, 2016 in Krakow as part of his visit to the World Youth Days (WYD). Pope Francis hea...

Pope Francis waves from popemobile on his way to Blonia Park on July 28, 2016 in Krakow to open the World Youth Days (WYD). Pope Francis became the fi...

Pope Francis waves from popemobile on his way to Blonia Park on July 28, 2016 in Krakow to open the World Youth Days (WYD). Pope Francis became the fi...

Pope Francis rides a popemobile on his way to Blonia Park on July 28, 2016 in Krakow to open the World Youth Days (WYD). Pope Francis became the first...

Pope Francis greets pilgrims from popemobile on his way to Blonia Park on July 28, 2016 in Krakow to open the World Youth Days (WYD). Pope Francis bec...

Pope Francis in popemobile at the Jasna Gora Monastery in Czestochowa, Poland, on July 28, 2016. Pope Francis heads to Poland for an international Cat...

Ukraine, Suburb of Kyiv, 14 July 2016 A boy emerging from a smoke-filled tunnel in the assault course that is part of the training by the Azov Battali...

Ukraine, Suburb of Kyiv, 14 July 2016 Military training by the nationalistic Azov Battalion at a holiday camp for children aged from 7 to 18. Ukrain...

Pope Francis (L) salutes Paloma Garcia Ovejero (R) at the Vatican on July 11, 2016. Pope Francis has named a former Fox TV correspondent, Greg Burke,...

Mandatory Credit: Photo by Steve Bisgrove/REX/Shutterstock (5738615j) Pope Francis Holy mass for the Solemnity of Saints Peter and Paul, Vatican, Ro...

Mandatory Credit: Photo by Steve Bisgrove/REX/Shutterstock (5738615l) Pope Francis Holy mass for the Solemnity of Saints Peter and Paul, Vatican, Ro...

Mandatory Credit: Photo by Pierpaolo Scavuzzo/AGF/REX/Shutterstock (5743383ab) Pope Francis Holy mass for the Solemnity of Saints Peter and Paul, Va...