The four-faced clock, atop the Abraj al-Bait Towers in Mecca, Saudi Arabia, stands over the holy Kaaba (the cube shaped building). The clock faces are 141 feet square. Saudi Arabia will test what it is billing as the world's largest clock in the holy city of Mecca during the Muslim fasting month of Ramadan. When completed in 2011, the tallest tower in the complex will become the tallest building in Saudi Arabia and the tallest and largest hotel in the world, with a planned height of 1,972 feet. Upon completion, the builders say the structure will have the largest floor area of any structure in the world with 16,150,000 square-feet of floor space.