Know Your Wisconsin: Cave of the Mounds

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Cave of the Mounds, located 20 miles west of Madison, was accidentally discovered back in 1939 when workers removing limestone from a quarry blasted into the cave. It revealed a cave over 20 feet high, made completely out of limestone, that opened up into separate rooms and galleries. “It began forming two million years ago and it is continuing to form today, so it’s an actively forming cave. All of the crystal formations that you’ll see here underground are still actively growing,” said Joe Klimczak. “The fossils that we see on the cave are 400 million years old, so it’s really a slice of Wisconsin history way, way back in time.” Explorers and visitors from all over have been going to the cave for over 75 years to see this ever-changing natural limestone cave.


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