Muslim pilgrims pray at the door of the Kabaa, the cube-shaped structure in the city’s Grand Mosque that Muslims around the world face in prayer five times a day in the Muslim holy city of Mecca, Saudi Arabia, Sunday, Oct. 13, 2013. The hajj, a central pillar of Islam and one that able-bodied Muslims must make once in their lives, is a four-day spiritual cleansing based on centuries of interpretation of the traditions of Prophet Muhammad. Photo: Amr Nabil, AP