2025 visitors: 11.5 million
Great Smoky Mountains National Park tops the chart of America’s most visited national parks. Stretching across Tennessee and North Carolina, the park is famous for its mist-covered mountains, ancient forests, waterfalls, and diverse wildlife. The best part, there is no entrance fee, making it one of the most pocket-friendly national parks in the country.
Best time to visit: April-May and September-November