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Makkah Royal Clock Tower, Saudi Arabia, cloud blue sky background

Towering over Mecca’s Grand Mosque, Makkah Royal Clock Tower is named after the clock that tops it, which was inspired by London’s Big Ben. Completed in 2012, the 601m tower is the world’s third tallest skyscraper. Clock Tower Museum, about the tower’s construction and how time has been measured through the ages, takes up the top four floors.