A nun prays as Pope Francis leads a mass at the Sanctuary of John Paul II during the World Youth Day...
A nun prays next to the cassock that John Paul II wore during the attack in St. Peter's Square on May 13, 1981, as Pope Francis leads a mass at the Sanctuary of John Paul II during the World Youth Day in Krakow, Poland July 30, 2016. REUTERS/Stefano Rellandini
