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Megastructures sears tower download
Documentary · 9 steel tubes of different lengths made this the tallest building in the world when construction was finished. : Secret World of Megastructures (Sears Tower/Petronas Towers/ World Trade Center/Biosphere/Aswan Dam/Three Gorges/Hoover Dam) [VHS]: Secret World Series: Movies & TV. 29 Sep Watch National Geographic Channel MegaStructures - Season 1, Episode 4 - Sears Tower: For 20 years, the Sears Tower held the record for the world's tallest building. Completed in , the stories high.
MegaStructures Willis Tower Sears Tower National Geographic Documentary. The Sears Towers The Sears Towers in Chicago held the record for the tallest building in the world for 23 years. Architect Bruce Graham and engineer Fazlur Rahman Khan faced the challenge of building this structure in one of America's windiest cities. They came up with a design that was wide at the bottom and narrow at.