Muslim pilgrims circumventing around the holly Kaaba located in the center of the Haram Sharif Great Mosque, during the Muslim's Hajj 2014 pilgrimage, in Mecca, Saudi Arabia, 25 September 2014. According to the Muslims holly book the Koran, the Kaaba was built by Abraham and his son Ismael, after Ismael had settled in Arabia. Millions of Muslims have arrived in Saudi Arabia to perform their Hajj. Photo by Ashraf Amra