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Pope Francis kisses the statue of the Virgin of Aparecida, Brazil's patron saint, during Mass in Aparecida Basilica, Brazil, July 24, 2013.

Shi'ite Muslims attend Friday prayers at the Imam Hussein shrine in the holy city of Kerbala, Aug. 15, 2014.

People pray during a Mass celebrated by Pope Francis outside the Aparecida Basilica in Aparecida, Brazil, Wednesday, July 24, 2013.

Thousands of young pilgrims gather on Copacabana Beach for a World Youth Day Mass in Rio de Janeiro, Brazil, July 23, 2013.

Messages written in a parking lot protest the shooting of Michael Brown in Ferguson, Missouri, Aug. 15, 2014.

Pope Francis greets the crowd of faithful from his popemobile in downtown Rio de Janeiro, July 22, 2013.

Youth from France, Venezuela and Canada who are in Brazil for World Youth Day events sing songs as they ride in a train that travels to Corcovado mountain where the statue Christ the Redeemer stands over Rio de Janeiro, Brazil, July 23, 2013.

Pope Francis kisses a baby while greeting the crowd of faithful from his popemobile in downtown Rio de Janeiro, July 22, 2013.

Pope Francis shakes hands with Brazilian President Dilma Rousseff after receiving a painting of Rio de Janeiro during a welcoming ceremony in Rio de Janeiro, July 22, 2013.

View of a sand sculpture depicting Pope Francis at Copacabana beach in Rio de Janeiro, Brazil, July 19, 2013. More than 1.5 million pilgrims from around the world are expected to flock to Rio de Janeiro for the July 22-28 visit during the World Youth Day.

Pilgrims embrace catholic nuns while watching as a wooden cross, symbol of the World Youth Day given to young people of the church in 1983 by Pope John Paul II, is carried along Copacabana beach in Rio de Janeiro, Brazil, July 21, 2013.

Pilgrims dance and sing at Copacabana beach ahead of Pope Francis' visit to Rio de Janeiro July 21, 2013.