The helicopter taking Pope Benedict XVI to Castel Gandolfo leaves the Vatican in Rome, Thursday, Feb. 28, 2013. Shortly before 5 p.m. on Thursday, Pope Benedict left the Apostolic palace inside the Vatican for the last time as pontiff, headed to the helipad at the top of the hill in the Vatican gardens and flew 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)

Associated Press
The helicopter taking Pope Benedict XVI to Castel Gandolfo leaves the Vatican in Rome, Thursday, Feb. 28, 2013. Shortly before 5 p.m. on Thursday, Pope Benedict left the Apostolic palace inside the Vatican for the last time as pontiff, headed to the helipad at the top of the hill in the Vatican gardens and flew 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)
The helicopter taking Pope Benedict XVI to Castel Gandolfo leaves the Vatican in Rome, Thursday, Feb. 28, 2013. Shortly before 5 p.m. on Thursday, Pope Benedict left the Apostolic palace inside the Vatican for the last time as pontiff, headed to the helipad at the top of the hill in the Vatican gardens and flew 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)