It's known as the sacred journey.

Muslims from all over the world performing the Haj, a pilgrimage to Islam's holiest sites.

The ritual starts in Saudi Arabia's Mecca, the birthplace of Muhammad and home to the sacred Kaaba shrine near the Mina Valley.

From there, millions declare their intention to perform the Haj at the Grand Mosque, circling the sacred Kaaba seven times.

This fifth pillar of Islam sends its pilgrims across the Mina Valley to Mt. Arafat.

While not required, some of the pilgrims scale the rock to continue their prayers - each time in the direction of the Kaaba.

The Koran states that all Muslims who are physically and financially able should make the Haj pilgrimage once in their lifetime.

Leaving before sunset, the masses move through Muzdalifah collecting pebbles and stones for al-Jamarat.

Inside the al-Jamarat, pilgrims pelt the walls, symbolizing Ibrahim's stoning of the devil and the rejection of temptation.

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