<p><br> Catch sweeping views of <a href="http://travel.nationalgeographic.com/travel/city-guides/chicago-illinois/">Chicago</a>'s skyline from the 103rd-floor Skydeck on the Willis Tower (formerly the Sears Tower), tallest building in the Western Hemisphere at 1,450 feet. "Chicago's architecture is breathtaking, literally," says James Conaway, author of "<a href="http://travel.nationalgeographic.com/travel/city-guides/chicago-green">Chicago: American's Green City</a>," a feature story in the September 2010 issue of <i>National Geographic Traveler.</i></p>

Skydeck


Catch sweeping views of Chicago's skyline from the 103rd-floor Skydeck on the Willis Tower (formerly the Sears Tower), tallest building in the Western Hemisphere at 1,450 feet. "Chicago's architecture is breathtaking, literally," says James Conaway, author of "Chicago: American's Green City," a feature story in the September 2010 issue of National Geographic Traveler.

Photograph by Melissa Farlow

Green Chicago

Photo Gallery: Chicago

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