11 of 15: Pope Benedict XVI is driven through the crowd in his pope-mobile as he arrives to celebrate his last general audience in St. Peter's Square, at the Vatican, Wednesday, Feb. 27, 2013. Benedict XVI basked in an emotional sendoff Wednesday at his final general audience in St. Peter's Square, recalling moments of "joy and light" during his papacy but also times of great difficulty. He also thanked his flock for respecting his decision to retire. (AP Photo/ Alessandra Tarantino)

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