- Mystery Cave State Park
- 21071 County 118
- Preston, MN 55965
- Phone: (507) 937-3251
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See natural wonders above and below ground and explore the cave world with its stalactites, stalagmites, and underground pools. Park naturalists provide tours of the cave throughout the summer and on weekends in the spring and fall, where the temperature stays at a constant 48 degrees Fahrenheit.