Burj Khalifa

The Burj Khalifa (previously known as Burj Dubai prior to inauguration) is a megatall skyscraper in Dubai, United Arab Emirates. Designed by Skidmore, Owings & Merrill, 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. Construction of the Burj Khalifa began in 2004; the exterior was completed five years later.