A few years ago I searched for caves of Minnesota, after exploring Mammoth Cave in Kentucky, and found Mystery Cave. This is a state park which offers tours through the largest caverns of the cave located in the bluffs of Southeastern Minnesota. We’ve attempted to plan a visit when we first discovered it but plans fell through so we kept it on a list of “someday” things to do. Fortunately this “someday” event actually was achieved this summer. We hosted a French student for a few weeks and thought this would be an enjoyable place to show some of the many faces of Minnesota. He had never been in a cave before and was fascinated with it.
Caves are very fascinating places and this one was no different. As is common, it is cool in Mystery Cave which felt nice on a hot summer afternoon. After descending a couple of flights of stairs we were transported into another world. Here is complete darkness surrounded by layers and layers of stone carved over thousands of years of water carrying away each piece it can grab until it can no longer flow through this area. These natural tunnels continue to transform yet today as water from the surface still drips through these rocks altering their environment.
As this water drips down the stone walls it carries with it minerals from above which separate from the water as it flows down these walls creating these veins throughout the caves giving them an appearance of life. The veins of Mystery Cave give it a beautiful and amazing ambiance adding to the wonder around each new cavern. What will this cave look like in a thousand years from now? What will be the same, if anything? What did the cave look like a thousand years ago?
This is the first cave I’ve toured that I saw an underground lake. While it was smaller than I was prepared for it was incredibly clear and had a very deceptive depth that could only be realized by shining light through the surface and moving it around. Even then the deception required a focused realization and understanding of what you are viewing. We continued through some of the narrow passageways returning to the beginning and climbed out to natural daylight squinting while adjusting to it once again. It was cool enough inside and hot and humid enough outside that everyone’s glasses fogged immediately upon exiting the cave making those with corrective lenses laugh as this usually happens during the winter, not summer.