CHICAGO - MAY 20: Downtown Chicago with John Hancock Center on May 20, 2013. It's a 100-story, 1,127-foot (344 m) tall skyscraper.When it topped out on May 6, 1968, it was the tallest building in the world outside New York City.

CHICAGO - MAY 20: Downtown Chicago with John Hancock Center on May 20, 2013. It's a 100-story, 1,127-foot (344 m) tall skyscraper.When it topped out on May 6, 1968, it was the tallest building in the world outside New York City. - 22947124

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