RIO DE JANEIRO, BRAZIL - JULY 25: Pope Francis ascends a stairway to speak in the Varghina favela, or shantytown, on July 25, 2013 in Rio de Janeiro, Brazil. More than 1.5 million pilgrims are expected to join Pope Francis for his visit to the Catholic Church's World Youth Day celebrations. Pope Francis will deliver his welcome address to the celebrations on Copacabana Beach later today as World Youth Day runs July 23-28. (Photo by Mario Tama/Getty Images)