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1 - Crystal Cave

2 - Cave of the Mounds
        Cave of the Mounds was made a National Natural Landmark by the Federal government and the National Park service 1988.  In comparison to Crystal Cave, Cave of the Mounds is roughly one third of the length at 1692 ft. of surveyed passageways but close to the same depth of 70 ft.  Cave of the mounds also differs from crystal in that it has no natural opening and was completely closed until miner found it in 1939.

3 - Niagara Cave
        Niagara Cave was named after Niagara Falls because of its 60 ft waterfall.  As well as being one of the largest karst caves in the Midwest it was ranked 2nd among central USA caves and 5th nationwide by a branch of the online travel agency Orbitz.

4 - Mystery Cave
        Mystery while being a Karst cave, like Crystal Cave, has also had its formation and shape affected by the part of the Root River that flows through it. Mystery Cave is Minnesota’s longest cave with more than 12 miles of passages that reach a maximum depth of just over 90 ft.

5 - Crystal Lake Cave
        Crystal Lake Cave was discovered in 1868 by accident when miners drilled into it while searching for lead.  While it contains an estimated 2.5 miles of passageway only half of it is accessible to the public with even its namesake lake being visible only through a small hole in the cave wall.  It reaches a depth of 100 ft. and contains no natural openings, much like Cave of the Mounds, which means it has no animal life.