The four-faced clock, atop the Abraj Al-Bait Towers, at centre rear, in Mecca, Saudi Arabia stands over the holy Kabaa, foreground. The clock faces are 43 × 43 m (141 × 141 ft). 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, the official news agency reported Tuesday, Aug. 10, 2010. The tallest tower in the complex will stand as the tallest building in Saudi Arabia, tallest and largest hotel in the world, with a planned height of 601 m (1,972 ft), including a 200 ft spire. Upon completion, the structure would have the largest floor area of any structure in the world with 1,500,000 m2 (16,150,000 sq ft) of floorspace.