Biggest Clock in The World is in Makkah (Mecca) Saudi Arabia
Saudi Arabia will test the world’s largest clock in the holy city of Mecca (Mekkah / Makkah) during Ramadan 2010. Clock tower with four sides will be installed on top of a big skyscraper has a total height of approximately 600 meters or the second highest in the world after the Burj al-Khalifa in Dubai.
This clock will also make a clock that became landmarks of London, Big Ben, who had occupied the position as at four sides of the world’s largest, to appear small. With a diameter of about 40 meters at this Saudi will be greater than the world champion is currently the largest clock hours Cevahir Mall in Istanbul, which has a width of 36 meters and placed on the roof of a shopping complex.
Scenery around the holy mosque of Mecca and the Ka’abah is part of Saudi Arabia efforts to develop a city that is visited by millions of pilgrims every year. Experiments hours will be held on the first week of Ramadan. Currently only one side of the four sides of hours that have been built and coated with 98 million pieces of mosaic glass.
On each side of these hours will be written ‘Allahu Akbar’ in Arabic is equipped with thousands of colored lights. Hours will be visible from a distance of about 25 kilometers. A planned observatory deck built on the basis of hours. Golden crescent form very large with a diameter of 23 meters will be placed on the clock and lights will be fired toward the crescent. The whole hour, from the bottom up with a crescent moon, was in itself will have 251 meters high.
German engineers and Swiss is the party that drafted hour spectacular. According to the Ministry of Religious Endowments, the entire project will cost 800 million U.S. dollars. At the same time seven-tower complex being built by the developer Arabia, Binladen Group. (Many Sources)

very big clock in the world ‘nice!!’