5. Great Smoky Mountains – Tennessee
The Great Smoky Mountains are both a national park and a UNESCO World Heritage site because it is one of the most visited national parks in North America (via Oyster). The park is so large that it sits in Tennessee and North Carolina, with plenty of recreational opportunities to keep you busy, including tubing, hiking, and horseback riding (via Oyster). The Great Smoky Mountains are also close to other attractions, including Dollywood, Chicken Guy! (the Guy Fieri restaurant), and Ripley’s Aquarium of the Smokies.