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668 kilometers is about 15,000 times as tall as The Chicago Water Tower.
In other words, it's 14,200 times the height of The Chicago Water Tower, and the height of The Chicago Water Tower is 0.00007040 times that amount.
(Chicago, Illinois)
The Chicago Water Tower is 0.0469 kilometers tall. The tower's architecture was one source of inspiration behind the design of White Castle fast-food restaurants beginning with "Building Number 8," a prefabricated structure built in Minneapolis, Minnesota in 1936.
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