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The Burj Khalifa is a ground-breaking feat of architecture and engineering, with two observation decks on the 124th and 148th floors. Soaring 828 metres above Dubai and currently the world's tallest building, the Burj Khalifa represents a union of art, engineering and heritage. Burj Khalifa is the tallest man-made structure ever built, at 2716.5 ft. This steel, glass and reinforced concrete tower was constructed between 2004 and 2010. The Burj Khalifa, the world's tallest building, isn't hooked up to a municipal sewage system, so its waste has to be trucked out of town..