Willis Tower, Skyscraper in Chicago
The Willis Tower, formerly known as the Sears Tower, is a 110-story skyscraper in Chicago.
Completed in 1973, it was the tallest building in the world until 1998.
It's a popular tourist attraction with its Skydeck on the 103rd floor offering panoramic views of Chicago.
The tower also houses offices and conference rooms.
The Willis Tower has 16,100 bronze-tinted windows.
Location: Chicago
Inception: 1974
Architects: Skidmore Owings Merrill, Bruce Graham, Fazlur Khan
Official opening: May 1973
Architectural style: International Style
Floors above the ground: 108
Floors below the ground: 3
Elevators: 104
Height: 442.1 m
Material: glass, aluminium, steel
Website: willistower.com
Source: Wikimedia