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Tallest Buildings in the World

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searstower2

Willis Tower
Chicago, Illinois


Willis Tower, formerly the Sears Tower, Chicago, is the second tallest building in the United States. Until the opening of the 1,483 ft (452 m) Petronas Towers (1997) in Kuala Lumpur, Malaysia, it was the world's tallest building. Constructed from 1970 to 1974 for Sears, Roebuck & Co., it rises 110 stories to a height of 1,450 ft (442 m); the 253 ft (77 m) television antenna topping it makes it the world's ninth tallest freestanding structure at 1,703 ft (519 m). Designed by the firm of Skidmore, Owings and Merrill, the building is supported structurally by square tubes of welded steel with floors suspended within the tubes, a technological innovation that was developed specifically for the mammoth skyscraper by architectural engineer Fazlur Kahn. The tower has an exterior of black aluminum and bronze-toned glass cut by black bands. It was renamed in 2009. Source: Columbia Encyclopedia.

Fun Fact: On a clear day, visitors can see Indiana, Wisconsin, and Michigan from the top of the Willis Tower.

Photo source: Soakologist

Next: Jin Mao Building
Shanghai, China

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Provided by Infoplease—an authoritative, comprehensive reference website that offers an encyclopedia, a dictionary, an atlas, and several almanacs. Visit Infoplease.com to find more resources endorsed by teachers and librarians.

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