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Pettyjohns Cave is another one on Pigeon Mountain: https://en.m.wikipedia.org/wiki/Pettyjohn_Cave

Used to take creative writing classes there in college. It’s beautiful, just make sure to wear clothes you don’t mind getting covered in mud and try not to go after a big rain because it will flood. Temperature is around 70 year round and it’s mostly hiking. Take a headlamp and a friend, tell someone where you are going, and have fun. Really incredible experience.