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.