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Muslim pilgrims perform the 'Tawaf' ritual around the Kaaba at Mecca's Grand Mosque before leaving the holy Saudi city at the end of the annual hajj pilgrimage on December 10, 2008. The official Saudi News Agency (SPA) reported that the most recent statistics put the total number of pilgrims this year at more than 2.4 million, almost 1.73 million from abroad and 679,000 from within the kingdom, mostly foreign residents. AFP PHOTO/KHALED DESOUKI (Photo credit should read KHALED DESOUKI/AFP/Getty Images)
Muslim pilgrims perform the 'Tawaf' ritual around the Kaaba at Mecca's Grand Mosque before leaving the holy Saudi city at the end of the annual hajj pilgrimage on December 10, 2008. The official Saudi News Agency (SPA) reported that the most recent statistics put the total number of pilgrims this year at more than 2.4 million, almost 1.73 million from abroad and 679,000 from within the kingdom, mostly foreign residents. AFP PHOTO/KHALED DESOUKI (Photo credit should read KHALED DESOUKI/AFP/Getty Images)

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    What is the Hajj pilgrimage?

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What is the Hajj pilgrimage?

As millions of Muslims around the world make their way to the holy city of Mecca, we look at one of the world's largest public gatherings.

What is the Hajj pilgrimage?

As millions of Muslims around the world make their way to the holy city of Mecca, we look at one of the world's largest public gatherings.