Peter's tomb, where he prayed accompanied by the patriarchs of Catholic Oriental Churches, he proceeded through the Basilica, followed by senior clergy, back toward the square.

CNN: March 19, 2013 -- Updated 0829 GMT (1629 HKT)

Benedict, 84, arrived in Cuba's southeastern city of Santiago de Cuba on Monday, later heading to the city's Basilica del Cobre where he prayed in front of the Virgin of Charity of Cobre, a wooden statue considered to be the shrine of the island's patron saint.

CNN: Pope's Havana visit raises questions of whom he'll meet

U.S. investigators have been trying to determine whether Tamerlan Tsarnaev was radicalized during his stay in the Caucasus, where he regularly prayed at a Makhachkala mosque.

NPR: Boston Suspects' Father Says He's Returning To US

In one incident last November, Tamerlan confronted a shopkeeper at a Middle Eastern grocery store in Cambridge, near a mosque where he sometimes prayed, after seeing a sign there advertising Thanksgiving turkeys.

WSJ: Boston Marathon Bombings: Turn to Religion Split Bomb Suspects Tamerlan and Dzhokhar Tsarnaev's Home

That town was the kind of place he remembered where you prayed side by side with your neighbors.

CNN: President Bush: 'Our whole nation grieves'

Ms. TERESA VAN DER HORN (Wife): We prayed about it and I said well, if he actually gets in, then that must be where God wants him, you know?

NPR: Venezuela Copes with Crumbling Infrastructure