Muslims Perform the Hajj

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Muslim pilgrims pray on a rocky hill called the Mountain of Mercy, some touching a marker at its peak, on the Plain of Arafat, near the holy city of Mecca, Saudi Arabia, Oct. 14, 2013.

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A Muslim pilgrim touches a marker at the top of a rocky hill called the Mountain of Mercy, on the Plain of Arafat near the holy city of Mecca, Saudi Arabia, Oct. 14, 2014.

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A Muslim pilgrim wears medical mask as he walks in Arafat near the holy city of Mecca, Saudi Arabia, Oct. 14, 2013.

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Muslim pilgrims pray at the door of the Kabaa, the cube-shaped structure in the city’s Grand Mosque that Muslims around the world face in prayer five times a day in the Muslim holy city of Mecca, Saudi Arabia, Oct. 13, 2013.