The Greenwich Mean Time is up for a stiff competition from the Mecca. The Muslim community worldwide is all set to synchronize their watches with a giant clock in the Islamic holy city of Mecca. Bearing a resemblance to the Big Ben tower the 2000 feet tall monument will feature a four-faced clock and will run on Arabia Standard Time; three hours ahead of GMT. Towering over the holy Kabaa in Mecca, Saudi Arabia at a height of 1,972 ft, will sit atop a massive skyscraper which when completed will be one of the world’s tallest buildings.