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Wisconsin is home to the only “bioluminescent” cave in the Midwest — but it's not what you think.

While true glowing caves are often found in tropical places, Cave of the Mounds near Blue Mounds, Wisconsin, contains unique calcite crystal formations that glow under UV light — a rare phenomenon in North America. These crystals fluoresce in vibrant blues, greens, and oranges, making the cave a hidden geological wonder that most locals don’t even know exists.