Pope Francis waves upon arriving at the Cathedral of St. Sebastian in Rio de Janeiro for a mass with bishops, priests and seminarians on July 27, 2013. Pope Francis joins young pilgrims in a prayer vigil on Rio's Copacabana beach Saturday as he presses his drive to breathe new life into a struggling Catholic faith. Hundreds of thousands of Catholics attending the five-day gathering World Youth Day are set to walk nine kilometers across the city to reach the beach venue for the vigil. AFP PHOTO / GABRIEL BOUYS