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" Geologists believe that the formation of the cave, which lies 156 feet (48 m) below ground, began several million years ago. Composed mainly of limestone deposited hundreds of millions of years ago when the Atlantic Ocean stretched far inland, the cave contains a lake called the Lake of Venus, as well as many speleothems.
Howe Caverns takes its name from a farmer named Lester Howe who discovered it on May 22, 1842. Noticing that his cows frequently gathered near some bushes at the bottom of a hill on hot summer days, Howe decided to investigate. Behind the bushes he found a hole with a strong, cool breeze emanating from it. Howe proceeded to dig out and explore the cave with his friend and neighbor, Henry Wetsel, on whose land the cave entrance was located. Even to this day, the cave is at a constant 52 degree Fahrenheit, irrespective of the outside weather. " -- Wikipedia