Burj Khalifa
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The Burj Khalifa (previously known as Burj Dubai prior to inauguration) 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 (2,722 ft, or just over half a mile) and a roof height (excluding the antenna, but including a 242.6 m spire) 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.