Great Onyx Cave is located in Mammoth Cave National Park. Interestingly, Great Onyx Cave has never been connected to Mammoth Cave or the rest of the Flint Ridge Cave system, despite the fact that some branches of those caves run beneath surveyed branches of Great Onyx Cave.
Historically, Great Onyx Cave was privately owned, and owners refused to sell it to the national government for many years. Finally, in 1961, the NPS acquired it and annexed it to Mammoth Cave National Park.
The cave is named because of the massive cave onyx formations.
Posted by Greg Heil on March 14, 2012
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