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Did you know that the longest cave system in the entire world 🌎 is located right here in the United States 🇺🇸? Mammoth Cave in Kentucky measures over 426 miles long 📏. It is estimated that there are another 600 miles in this cave system that has not been discovered yet 😳. Mammoth Cave is also a National Park, the 40th National Park we have visited in The Hocking Adventure Bus 🚌!If you want to go into the cave you must book 📖 a tour in advance. There are several to choose from and we picke
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