Starting tomorrow, 115 cardinals at the Vatican will begin selecting a new pope.

A general view of St. Peter's Basilica (Jeff J Mitchell/Getty Images)

On Sunday, the cardinals celebrated Mass at local parishes where people packed churches and took photos. In one church, the parish priest introduced Boston Cardinal Sean O'Malley as the cardinal he hoped would make his next visit as pontiff.

Cardinal Angelo Scola of Milan, who's also considered a top papal contender, distributed communion at Church of the Twelve Holy Apostles.

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