Muslim worshippers circumambulate around the Kaaba, Islam's holiest shrine, at the Grand Mosque in Saudi Arabia's holy city of Mecca on August 17, 2018 prior to the start of the annual Hajj pilgrimage in the holy city. - Muslims from across the world are gathering in Mecca in Saudi Arabia for the annual hajj pilgrimage, one of the five pillars of Islam. (Photo by AHMAD AL-RUBAYE / AFP)
Muslim worshippers circumambulate around the Kaaba, Islam's holiest shrine, at the Grand Mosque in Saudi Arabia's holy city of Mecca on August 17, 2018 prior to the start of the annual Hajj pilgrimageShow more

Hajj 2018: Two million Muslims to begin their pilgrimage