Worlds Highest Clock

The World's highest clock is situated in Holy city of Makkah. It is called Abraj Al-Bait Towers also known as the "Makkah Royal Clock Hotel Tower".  The clock is completed recently and is on test run but the skyscrapper is underconstruction and will be completed in 2011 and building by Saudi Binladin Group.When the structure is complete it would be the largest floor area of any structure in the world with 1,500,000 m² (16,150,000 sq ft) of floorspace. The clock is six times bigger than the Big  Ben Clock which is situated in London.
The whole Complex includes 7 towers. The Hotel tower with planned height of 601 meters (1,972 feet) with 95 floors. The Hajar and ZamZam tower with planned height of 260 meters (850 feet) with 48 floors. The Maqam and Qibla towers with planned height of 250 meters (820 feet) with 42 floors. And Marwah and Safa tower with planned height of 240 meters ( 790 feet) with 42 floors. 

The Clock is completed and can be seen from 25 kilometers (16 miles) through naked eye. This Four Faced Clock has 46 meters (151 feet) of diameter and is illuminated by 2 million LED lights.