Muslim pilgrims ascend Mount Al-Noor ahead of the annual haj pilgrimage in Mecca October 10, 2013. Mount Al-Noor houses Ghar-E-Hira or Hira cave, where Prophet Mohammad is said to have spent a great deal of time in the cave meditating and it is believed that he had received his first revelation inside this cave. REUTERS/Ibraheem Abu Mustafa (SAUDI ARABIA - Tags: RELIGION)