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A dimly-lit cave in Mammoth Cave National Park. Mammoth Cave National Park, located in central Kentucky, was established in 1941 and is home to the longest known cave system in the world, with over 400 miles of explored passages. The park offers guided cave tours that showcase stunning formations such as Frozen Niagara, Grand Avenue, and the Historic Entrance. Visitors can also enjoy above-ground activities, including hiking through lush forests, canoeing on the Green River, and observing the park’s diverse wildlife and natural beauty.