Burj Khalifa , f ormerly known as Burj Dubai , is a skyscraper in Dubai, U.A.E. , and is currently the tallest structure ever built, at 828 m (2,717 ft). Tower Construction began on 21 September 2004, with the exterior of the structure completed on 1 October 2009. The building officially opened on 4 January 2010. Current records Tallest skyscraper to top of spire: 828 m (2,717 ft) - previously Taipei 101 – 509.2 m (1,671 ft) Tallest structure ever built: 828 m (2,717 ft) (previously 646.38 m (2,121 ft)) Warsaw radio mast Tallest extant structure: 828 m (2,717 ft) (previously KVLY-TV mast – 628.8 m (2,063 ft)) Tallest freestanding structure: 828 m (2,717 ft) (previously CN Tower – 553.3 m (1,815 ft)) Building with most floors: 160 (previously – 108 floors in Willis Tower) World's highest elevator installation World's fastest elevators at speed of 64 km/h (40 mph) or 18 m/s (59 ft/s) (previously Taipei 101 – 16.83 m/s) Highest vertical concrete pumping (for
Civil engineering is a professional engineering discipline that deals with the design, construction and maintenance of the physical and naturally built environment, including works such as bridges, roads, canals, dams and buildings.