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Above and Below (5 Photos)
Mammoth Cave National Park is a crossroads between the sunlit and subterranean worlds. These images are an introduction to what has been called a "grand, gloomy, and peculiar place."
Did You Know?
Creatures that spend their entire lives in Mammoth Cave adapt to the dark world. Some types of cave fish, for example, do not grow eyes – supporting these extra unnecessary organs would consume precious energy in their nutrient-poor environment.