Muslim pilgrims pray atop Mount Thor in the holy city of Mecca ahead of the annual haj pilgrimage October 11, 2013. Mount Thor marks the start of the journey of the Prophet Mohammad and his companion Abu Bakr Al-Sadeeq from Mecca to Medina. It houses Thor cave where Prophet Mohammed is believed to have hid from the people of Quraish before his Hijra (migration) to Medina. REUTERS/Ibraheem Abu Mustafa