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Burj Khalifa
Credit: Getty Images
DUBAI, UNITED ARAB EMIRATES - FEBRUARY 23: Workers clear the water at the bottom of the Burj Khalifa on February 23, 2012 in Dubai, United Arab Emirates. At 829.84 m (2723 ft) tall the Burj Khalifa is currently the tallest building in the world. (Photo by Chris Jackson/Getty Images)
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