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For many travelers, deciding what to see while on a trip is just like being in high school: Popularity is everything. Just follow the crowd to these top tourist destinations. By Haley Shapley

LIKE SHOPAHOLICS to a blowout sale and American Way staffers to free loot, millions of people each year are drawn to these sights. From landmarks steeped in history to the magical world of Disney (times three), each offers a little something different. It took some digging, but here are what we found to be the most popular must-sees in or near some great destinations.

011-52-998-883-3293, www.xel-ha.com
Visitors annually: 900,000
Snorkel, snuba (a cross between scuba diving and snorkeling), and swim with the dolphins at this hands-on water park. A children's playground, rope swings, and an ecological tour ensure that there's something for everyone, from babies to grandpas.

Navy Pier
(800) 595-7437, www.navypier.com
Visitors annually: 8.6 million
This one-stop shop for entertainment needs dates back to 1916 and features the Chicago Children's Museum, a Ferris wheel and other rides, a 440- seat IMAX theater, daily performances on numerous stages, and a fireworks show (two nights a week during the summer).