First Sears sold the building and moved to cheaper suburban offices in 1992. Then the skyscraper got an ego blow when the Petronas Towers in Kuala Lumpur, Malaysia, went up and laid claim to the title of world's tallest buildings. (The Sears Tower has since put up a 22-ft. antenna in an attempt to win back the title.) Tallest-building posturing aside, this is still a great place to orient yourself to the city, but I wouldn't put it on the top of must-see sights for anyone with limited time (and limited patience for crowds).

The view from the 103rd-floor Skydeck is everything you'd expect it to be -- once you get there. Unfortunately, you're often stuck in a very long, very noisy line, so by the time you make it to the top, your patience could be as thin as the atmosphere up there. (Come in the late afternoon to avoid most of the crowds.) On a clear day, visibility extends up to 50 miles, and you can catch glimpses of four surrounding states. Despite the fact that it's called a "skydeck," you can't actually walk outside. Recent upgrades include multimedia exhibits on Chicago history and Knee High Chicago, an exhibit for kids. The 70-second high-speed elevator trip will feel like a thrill ride for some, but it's a nightmare for anyone with even mild claustrophobia. Allow 1 to 2 hours, depending on the length of the line.