In the early 1900’s, tourists flocked to Horse Cave to visit Hidden River Cave, once billed as “the World’s Largest Cave Entrance.” By the 1940’s the cave had become so polluted that it was closed to the public and no longer used as the city’s water supply. The cave’s restoration in 1993 was one of the most remarkable environmental success stories in America and a breath of fresh air for Horse Cave. Today, Horse Cave, Kentucky is a constant reminder of the delicate balance between caves and the sunlit world above.