Known for outstanding architecture, it can hardly be surprising that Chicago houses the building that stands out most in the US, and in the world by some definitions; it is either the tallest, second-tallest, or third-tallest building in the world, depending on measurements of the inhabitable floors, roof or antenna height. The tower is 1,454 feet tall with 110 floors, and constructed like nine square tubes, like nine cigarettes protruding from a pack. The shortest tubes are 50 stories, the second set rises to 66, the third set to 90, and the final to 110 stories.

Written by  George Monkhouse.

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