Home to the longest cave system in the world, Mammoth Cave National Park protects more than 400 miles of limestone caverns hidden under the rolling hills of Kentucky. All visitors are required to purchase a tour ticket if they want to enter the caves, but there are a variety of different options to choose from. The easiest tour requires only half a mile of walking, but other options include a half-day historic tour and a challenging six-hour tour that requires squeezing through tight spaces. Reservations are strongly suggested for all tours in the summer and on weekends.

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