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The busiest national parks

Do you know which national park gets the most visitors each year? It's not one of our most iconic parks -- Grand Canyon, Yellowstone, Yosemite -- although those are on the Top 10 list. It's Great Smoky Mountains National Park, which is within a days' driving distance of 50 percent of the U.S. population. The park, which sprawls across the Tennessee-North Carolina state line, draws 6.4 million visitors a year. Here's a list of the 10 busiest parls. But keep in mind that busiest is not the same as most crowded. These parks vary widely in size and how much of the park is easily accessible.