Muslim pilgrims go through passport control upon their arrival at Jeddah airport on July 14,2018, prior to the start of the annual Hajj pilgrimage in the holy city of Mecca. – The Hajj, the largest annual pilgrimage in the world, is the fifth pillar of Islam, a religious duty that must be carried out at least once in the lifetime of every able-bodied Muslim who can afford to do so. (Photo by Amer HILABI / AFP)