In a bold engineering competition with the amazing wooden spires, Dubai opened the world's tallest skyscraper on Monday. Called the Burj Khalifa, it is 160 stories & 2717 feet tall.The tallest building in the United States, the Sears Tower (now called Willis Tower) in Chicago [pictured], comes in at 1,451 feet (108 stories), although with its spire it measures 1,729 feet & would be considered even taller than Taipei 101.
The BurKha tower was designed by Chicago-based Skidmore, Owings & Merrill, which has a long track record in engineering some of the world's tallest buildings, including the Willis [née Sears] Tower.
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