Bookable
An Apollonaut travel guide
Moments in a longer story.
Selected milestones in the history of Willis Tower and its Skydeck.
On this page
Tower, Skydeck and Ledge
These dates describe the place you can learn about here. They are not a company timeline for Apollonaut.
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1970
Construction begins
Work starts on the tower designed by Bruce Graham and Fazlur Rahman Khan.
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3 May 1973
Topped out
The tower reaches its full height.
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September 1973
The Sears Tower opens
It becomes the tallest building in the world.
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22 June 1974
The Skydeck opens
The observation deck opens on the 103rd floor, 1,353 feet above the street.
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1998
A record passes
The tower is no longer the world’s tallest building.
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2 July 2009
The Ledge
Glass boxes open on the 103rd floor, reaching about four feet out from the building.
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16 July 2009
Willis Tower
The Sears Tower is officially renamed Willis Tower.
Follow the stories behind the dates
A timeline is a beginning. The longer history introduces the people and places; the sources below provide further context.
Read at the source
Sources & further reading
Links lead to the original publishers.