Muslim pilgrims gather at Mecca’s Grand Mosque on November 18, 2009. Some 2.5 million Muslims from more than 160 countries converge annually on the Islamic holy cities of Mecca and Medina in western Saudi Arabia for the hajj pilgrimage — to be completed at least once in a Muslim’s lifetime, under the tenets of Islam. AFP PHOTO/MAHMUD HAMS (Photo credit should read MAHMUD HAMS/AFP/Getty Images)