The most visited national park in America with 13 million visitors annually—double that of Grand Canyon National Park's 6 million—the Smokies straddle the Tennessee-North Carolina border across 522,427 acres of ancient Appalachian forest. It is a UNESCO World Heritage Site protecting more tree species than all of northern Europe, with 19 peaks exceeding 6,000 feet elevation, making it taller than Great Smoky Mountains' average rival in biodiversity.
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