In this picture made available by the Vatican newspaper L'Osservatore Romano, Pope Francis, flanked by Cardinal Angelo Comastri, left, and Bishop Vittorio Lanzani, right, kneels in pray

 

              In this picture made available by the Vatican newspaper L
In this picture made available by the Vatican newspaper L'Osservatore Romano, Pope Francis, flanked by Cardinal Angelo Comastri, left, and Bishop Vittorio Lanzani, right, kneels in prayer in front of what is believed to be the burial site of St. Peter's in the necropolis where pagans and early Christians were buried under St. Peter’s Basilica at the Vatican, Monday, April 1, 2013, during what was called the first-ever visit by a pope to the necropolis. The basilica was built over the location where early Christians would gather in secret, at a time of persecution in ancient Rome, to pray at an unmarked tomb believed to be that of Peter, the apostle Jesus chose to lead his church. (AP Photo/L'Osservatore Romano)