5. Onondaga Cave (USA)
This cave forms part of the Missouri National Park, founded in 1982. It is an incredible place where tourists can enjoy cave tours, fishing, hiking and picnicking. The cave itself is full of active flowstones, soaring stalagmite and remarkable stalactites.
Fun Fact: Surprisingly enough, this tranquil area has a history of vandalism and land disputes ( these were settled in the 1850’s).
