Tapestry portraits of Pope John Paul II (left) and Pope John XXIII hang from balconies on the facade of St. Peter's Basilica in Rome. On Sunday, the two pontiffs will officially be declared saints. Claudio Peri/EPA/Landov hide caption

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Tourists walk past a poster of Pope John Paul II on April 13 in Rome. Gregorio Brogia/AP hide caption

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2,000 Buses Of Visitors: Rome Braces For Canonization Crowds
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Despite some differences, President Obama and Pope Francis shared a laugh during their Thursday meeting at the Vatican. Obama called himself a "great admirer" of the pope. Gabriel Bouys/AFP/Getty Images hide caption

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President Obama and Michelle Obama meet Pope Benedict XVI at the Vatican in 2009. The president will meet Pope Francis at the Vatican on Thursday. Getty Images hide caption

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The Sometimes Tricky Relations Between Popes And Presidents
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Then-Bishop Franz-Peter Tebartz-van Elst last August. The Vatican has accepted his resignation. Tebartz-van Elst spent lavishly on renovations at his residence and allegedly made false statements about expensive travel costs. Fredrik Von Erichsen /DPA/Landov hide caption

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Marie Collins, who was assaulted as a 13-year-old by a priest in her native Ireland, will be a member of a commission that advises the Roman Catholic Church about confronting and preventing such abuse. Andrew Medichini/AP hide caption

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Pope Francis greets the crowd as he arrives for his general audience in St. Peter's Square at the Vatican last month. Vincenzo Pinto/AFP/Getty Images hide caption

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One Year Later, 'A Pope For All' Keeps Catholics Guessing
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