hajj

Muslim pilgrims gather on Mount Arafat n...Muslim pilgrims gather on Mount Arafat near Mecca as they perform one of the Hajj rituals late on October 3, 2014. The pilgrims perform a series of rituals during the annual Hajj. They circumambulate the kaaba seven times, runs back and forth between the hills of Al-Safa and Al-Marwah, drink from the Zamzam Well, goes to the plains of Mount Arafat to stand in vigil, and throws stones in a ritual Stoning of Devil. The pilgrims then shave their heads, perform a ritual of animal sacrifice, and celebrate Eid al-Adha holiday.  AFP PHOTO/MOHAMMED AL-SHAIKHMOHAMMED AL-SHAIKH/AFP/Getty Images

AL-Shaikh Mohammed/AFP/Getty

Muslim pilgrims gather on Mount Arafat near Mecca, Saudi Arabia as they perform one of the Hajj rituals Read more

A Muslim pilgrim prays atop Mount Mercy on the plains of Arafat during the peak of the annual haj pilgrimage, near the holy city of Mecca early morning October 14, 2013.  An estimated two million Muslims were in Mecca, Saudi Arabia, on Monday morning for the start of the annual Haj pilgrimage.

Ibraheem Abu Mustafa/Reuters

A Muslim pilgrim prays atop Mount Mercy on the plains of Arafat during the peak of the annual Haj pilgrimage, near the holy city of Mecca early on Monday morning. An estimated 2m Muslims were in Mecca, Saudi Arabia, for the start of the annual Haj pilgrimage.