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668 kilometers is about 1,500 times as tall as The Sears Tower.
In other words, it's 1,270 times the height of The Sears Tower, and the height of The Sears Tower is 0.000787 times that amount.
(a.k.a. Willis Tower) (Chicago, Illinois) (to antenna peak)
The Willis Tower rises to 0.5270 kilometers to the top of its tallest antenna. The bathrooms on the 103rd floor are said to be the highest in the western hemisphere at 0.4120 kilometers.
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