The Willis Tower (formerly and informally: Sears Tower, its title until 2009) is a 110-story, 1,450-foot (442.1 m) skyscraper in Chicago. At completion in 1973, it surpassed the World Trade Center in New York City to become the tallest building in the world, a title that it held for nearly 25 years; it was also the tallest building in the Western Hemisphere for 41 years, before the new One World Trade Center surpassed it in 2013. While it held the title of'Tallest Office Building' before 2013, it dropped the title of'Tallest Man-Made Construction' after only 3 decades. The CN Tower in Toronto, which functions as a communications tower, took over the title in 1976.
The Willis Tower is considered a seminal accomplishment for engineer Fazlur Rahman Khan. It is currently the third-tallest construction in the USA and the Western hemisphere -- and the 23rd-tallest in the world.
Kingdom Centre (Arabic: ???? ????????) is a 99-story, 302.3 m (992 ft) skyscraper in Riyadh, Saudi Arabia. When completed in 2002, it overtook the 267-meter Faisaliyah Tower as the tallest tower in Saudi Arabia. It has since been surpassed and has become the fifth-tallest skyscraper in the nation, whose tallest two buildings are the Abraj Al Bait Towers and the Capital Market Authority Tower. It is the world's third-tallest building with a hole following the Shanghai World Financial Center and the 85 Sky Tower in Taiwan. The mixed-use tower was created by Prince Al-Waleed bin Talal and designed by the group of Ellerbe Becket and Omrania, who were selected through an international design competition. It is situated on a 100,000--square-metre website and houses the 57,000-square-meter Al-Mamlaka shopping mall, offices, the Four Seasons Hotel Riyadh, and luxury apartments. There is a 65m skybridge atop the skyscraper.The upper third of the tower features an inverted parabolic arch topped by a public sky bridge. The sky bridge is a 300-ton steel construction, taking the kind of an enclosed corridor with windows on either side. After paying the entrance fees, visitors take two elevators to reach that level.Source: Wikipedia
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