Nuns from the United States dance as they wait for the Holy Mass with Pope Francis (not seen) at the Campus Misericordiae in Brzegi, Poland, 31 July 2016. Today Pope Francis will celebrate the holy mass ending the World Youth Day 2016 in Poland. (Photo by Marcin Obara/EPA)





Security officers observe before Pope Francis arrival to the Campus Misericordiae during World Youth Day in Brzegi near Krakow, Poland July 31, 2016. (Photo by David W. Cerny/Reuters)





Pope Francis arrives to the Campus Misericordiae during World Youth Day in Brzegi near Krakow, Poland July 31, 2016. (Photo by David W. Cerny/Reuters)





A pilgrim climbs onto a sign as Pope Francis arrives to the Campus Misericordiae during World Youth Day in Brzegi near Krakow, Poland July 31, 2016. (Photo by Stefano Rellandini/Reuters)





Pope Francis receives a Panama sombrero from a journalist on the plane as he travels from Poland back to Italy, July 31, 2016. (Photo by Stefano Rellandini/Reuters)





The faithful greet Pope Francis as he arrives to the Campus Misericordiae during World Youth Day in Brzegi near Krakow, Poland July 31, 2016. (Photo by Stefano Rellandini/Reuters)





Clergy members attend a mass lead by Pope Francis at the Campus Misericordiae during World Youth Day in Brzegi near Krakow, Poland July 31, 2016. (Photo by David W. Cerny/Reuters)





Pilgrims covered in raincoats wait for Pope Francis at the Campus Misericordiae during World Youth Day in Brzegi near Krakow, Poland July 31, 2016. (Photo by Kuba Ociepa/Reuters/Agencja Gazeta)





Pilgrims sleep as sun rises at the Campus Misericordiae during World Youth Day in Brzegi near Krakow, Poland July 31, 2016. (Photo by Mateusz Skwarczek/Reuters/Agencja Gazeta)





Pilgrims rest behind a fence at the Campus Misericordiae during World Youth Day in Brzegi near Krakow, Poland, July 31, 2016. (Photo by Lukasz Krajewski/Reuters/Agencja Gazeta)





A nun looks on as pilgrims sleep at the Campus Misericordiae during World Youth Day in Brzegi near Krakow, Poland July 31, 2016. (Photo by Kuba Ociepa/Reuters/Agencja Gazeta)





Pope Francis waves at the pilgrims as he arrives at the Campus Misericordiae during World Youth Day in Brzegi near Krakow, Poland July 31, 2016. (Photo by Agata Grzybowska/Reuters/Agencja Gazeta)





Pilgrims chat as they wait for Pope Francis at the Campus Misericordiae during World Youth Day in Brzegi near Krakow, Poland, July 31, 2016. (Photo by Slawomir Kaminski/Reuters/Agencja Gazeta)





The World Youth Day volunteers cheer as Pope Francis arrives at Tauron Arena, Krakow, Poland July 31, 2016. (Photo by Jakub Porzycki/Reuters/Agencja Gazeta)





Pope Francis boards a plane during his departure at Balice airport near Krakow, Poland July 31, 2016. (Photo by Michal Lepecki/Reuters/Agencja Gazeta)





A nun holds a rosary as she waits for Pope Francis farewell ceremony at Balice airport near Krakow, Poland July 31, 2016. (Photo by Kacper Pempel/Reuters)





People sit atop chairs as they watch Pope Francis' departure at Balice airport near Krakow, Poland July 31, 2016. (Photo by Michal Lepecki/Reuters/Agencja Gazeta)





People during heavy rain under raincover wait for Pope Francis farewell ceremony at Balice airport near Krakow, Poland July 31, 2016. (Photo by Kacper Pempel/Reuters)





Pope Francis waves during the farewell ceremony at Balice airport near Krakow, Poland July 31, 2016. (Photo by Kacper Pempel/Reuters)





A flag with Pope Francis picture is seen before the farewell ceremony at Balice airport near Krakow, Poland July 31, 2016. Sign in Polish reads “World Youth Day”. (Photo by Kacper Pempel/Reuters)