Think you know all there is to know about the Willis Tower? Test your knowledge with these 11 fast facts about this iconic Chicago building.

1. Willis Tower is 1,450 feet tall, 1,729 feet to the tip.
Richard Hsu/Flickr
2. Construction started in 1970 and the building was finished in 1973.
btwashburn/Flickr
3. Sears Roebuck moved out of the building in 1988, but the building retained the name for two more decades.
Tom Ravenscrodt/Flickr
4. The building weighs more than 222,500 tons.
arlexitus/Flickr
5. Daredevils can walk out on this clear platform, under which it is 1,353 feet down.
vagueonthehow/Flickr

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6. The building cost more than $175 million to build.
Benjamin Lipsman/Flickr
7. There are 16,100 windows in the building.
arlexitus/Flickr
8. Willis Tower has 4.56 million gross square feet.
Kevin Corazza/Flickr
9. There are 1,500 miles of electric wiring in the building.
Ben Grey/Flickr
10. On a clear day, you can see Illinois, Indiana, Wisconsin and Michigan.
Roman Emin/Flickr
11. It took the efforts of 2,000 workers to complete this building.
Arvell Dorsey Jr./Flickr

Did you know all of these facts?

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