A general view of the city of Mecca and the Grand Mosque is seen from the Mecca Clock Tower during the Muslim month of Ramadan September 4, 2010. Muslims around the world abstain from eating, drinking and conducting sexual relations from sunrise to sunset during Ramadan, the holiest month in the Islamic calendar.The Mecca Clock, which Riyadh says is the world's largest, has four faces measuring 43 metres in diameter. It sits 400 metres up what will be the world's second-tallest skyscraper and largest hotel, overlooking the Grand Mosque, which Muslims around the world turn to five times a day for prayer. [China Daily/Agencies]