Fisher-Ridge Karsthöhle was discovered in 1981 and is located on the territory of the Kentucky state. The length of their complicated labyrinths is about 113 km. The distinctive peculiarity of the cave is the variety of the inner bays connecting the complex complex of galleries. The cave is multi-stepped and is, according to the researchers, constantly under the influence of the underground rivers further developed and expanded.
At present, the researchers know three natural inputs into the cave, one of which is within reach of the largest cave in the world - the mammoth cave. When researching the tunnel, one has found a lot of unique artifacts, including the rock drawings. The age of some of them is more than a thousand years, which indicates that the cave was inhabited in the ancient times and served as a safe shelter for the aborigines.
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