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Burj Khalifa
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The Burj Khalifa is a megatall skyscraper in Dubai, United Arab Emirates. Designed by the SOM architectural firm, it is the world's tallest structure, with a total height of 829.8 m and a roof height of 828 m (2,717 ft). It has been the tallest building in the world since its complete inauguration in 2011, surpassing Taipei 101, which had held the record since 2004.