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Mammoth Cave, located in Kentucky, is the world's longest known cave system with over 400 miles of explored passageways. Discovered over 4,000 years ago, Mammoth Cave has a rich history of Native American inhabitation and ... early exploration. Visitors can enjoy guided tours through its vast chambers, underground rivers, and intricate limestone formations. Popular activities include cave exploring, hiking, and wildlife spotting. The best time to visit is during the spring and fall when the weather is mild and the park is less crowded. Immerse yourself in the local culture by learning about the cave's significance to Native American tribes and early settlers. Read more ▼