Burj Khalifa, known as Burj Dubai prior to its inauguration, is a skyscraper in Dubai, and is the tallest man-made structure in the world, at 829.8 m (2,722 ft). Construction began on 21 September 2004, and officially opened on 4 January 2010, and is part of the new 2 km2 (490-acre) development called Downtown Dubai. Burj Khalifa […]