A skyscraper is a tall, continuously habitable building. There is no official definition or height above which a building may clearly be classified as a skyscraper
Burj Dubai "Dubai Tower", a supertall skyscraper under construction in Dubai, United Arab Emirates, is the tallest man-made structure ever built, at 818 m (2,684 ft). Construction began on 21 September 2004, and the tower is expected to be completed and ready for occupancy by the end of 2009.
1 World Trade Center, formerly known as the Freedom Tower, is the main building of the new World Trade Center under construction in Lower Manhattan in New York City, USA. The tower will be located in the northwest corner of the 16-acre (65,000 m²) World Trade Center site, bound by Vesey, West, Washington and Fulton streets.
Taipei 101 is a landmark skyscraper located in Xinyi District, Taipei, Taiwan. The building, designed by C.Y. Lee & Partners and constructed primarily by KTRT Joint Venture, is the world's tallest completed skyscraper according to the Council on Tall Buildings and Urban Habitat, the arbiter of tall building height. Taipei 101 received the Emporis Skyscraper Award in 2004. It has been hailed as one of the Seven New Wonders of the World (Newsweek magazine, 2006) and Seven Wonders of Engineering (Discovery Channel, 2005)
The Shanghai World Financial Center (Abbr: SWFC) It is a mixed use skyscraper which consists of offices, hotels, conference rooms, observation decks, and shopping malls on the ground floors. Park Hyatt Shanghai is the hotel component containing 174 rooms and suites. It is the highest hotel in the world, surpassing the Grand Hyatt Shanghai on the 53rd to 87th floors of the neighboring Jin Mao Tower.
The Petronas Twin Towers (also known as the Petronas Towers or just Twin Towers), in Kuala Lumpur, Malaysia are twin towers and were the world's tallest buildings before being surpassed by Taipei 101. However, the towers are still the tallest twin buildings in the world. They were the world's tallest buildings from 1998 to 2004 if measured from the level of the main entrance to the structural top.
Willis Tower, formerly named Sears Tower, is a 108-story 1,450 feet (442 m) skyscraper in Chicago, Illinois. At the time of its completion in 1973 it was the tallest building in the world, surpassing the World Trade Center towers in New York. Currently, Willis Tower is the tallest building in the United States