Willis Tower, Skyscraper in Chicago Loop, United States
The 442-meter Willis Tower contains 108 floors above ground, constructed with steel, aluminum, and glass in the International Style architecture movement.
When completed in 1974, the structure remained the tallest building in the world for over two decades until the Petronas Towers surpassed it.
The structure represents Chicago's leadership in skyscraper innovation, designed by architects Bruce Graham and Fazlur Khan from Skidmore Owings Merrill firm.
The Skydeck observation deck on the 103rd floor receives 1.7 million visitors annually and provides views spanning across four different states.
The building features nine square tubes in a 3x3 matrix configuration, with seven tubes stepping back at different heights to create its distinct profile.
Location: Chicago
Inception: 1974
Architects: Skidmore, Owings & Merrill, Bruce Graham, Fazlur Khan
Official opening: May 1973
Architectural style: International Style
Floors above the ground: 110
Floors below the ground: 3
Elevators: 104
Height: 442.1 m
Made from material: glass, aluminium, steel
Website: http://willistower.com
GPS coordinates: 41.87861,-87.63583
Latest update: May 26, 2025 11:20
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