Nuns pray in St. Peter's Square, at the Vatican, Thursday, Feb. 28, 2013. Shortly before 5 p.m. on Thursday, Pope Benedict will leave the Apostolic palace inside the Vatican for the last time as pontiff, head to the helipad at the top of the hill in the Vatican gardens and fly to the papal retreat at Castel Gandolfo south of Rome. There, at 8 p.m. sharp, Benedict will become the first pontiff in 600 years to resign. (AP Photo/Gregorio Borgia)
{}