WEBCompleted in 2009, the Burj Khalifa, in Dubai, United Arab Emirates is currently the tallest building in the world, with a height of 829.8 meters (2,722 ft). The setbacks at various heights are a typical skyscraper feature.. A skyscraper is a tall continuously habitable building having multiple floors. Modern sources define skyscrapers as being at least 100 meters (330 ft) or 150 meters (490 ...