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Muslim pilgrims attend Friday prayers at the Grand mosque in the holy city of Mecca ahead of the annual haj pilgrimage

Muslim pilgrims attend Friday prayers at the Grand mosque in the holy city of Mecca ahead of the annual haj pilgrimage October 11, 2013. REUTERS/Ibraheem Abu Mustafa (SAUDI ARABIA - Tags: RELIGION)

Haj 2013: journey to Mecca

Millions of Muslims from around the world travel to Mecca, Saudi Arabia for the annual pilgrimage of Haj, the fifth pillar of Islam. This year, Haj falls on October 14.