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Since 1969 this building has been one of the most recognizable monoliths of the Chicago skyline. The sloping sides of the 100-story, 1127-foot tower are designed to deflect strong winds. Unlike many other skyscrapers the John Hancock Center is a multiy-use structure: combining offices, shops, apartments and parking in one building as a self-contained urban village. The John Hancock Center is the fourth-tallest building in Chicago after the Sears Tower, Trump Tower and AON Center.

Read more:

The official John Hancock Observatory website
Fazlur Khan, engineer of the tower
WTB: the World's Tallest Buildings
Nalyd's Skyscraper Page
Building Blocks: The John Hancock Center, by Ezra Stoller, published by Princeton Architectural Press (2000)
The Cloudbase Chronicles: Life at the Top, by Harry W. Budge III, published by Outskirts Press (2009)

How to build the John Hancock Center Order the postcard