Exploring a subterranean river in the Mammoth Cave, Kentucky, USA, c1870. Artist: Unknown

Exploring a subterranean river in the Mammoth Cave, Kentucky, USA, c1870. Artist: Unknown

1-151-690 - Ann Ronan Picture Library/Heritage-Images

Exploring The Styx, a subterranean river in the Mammoth Cave, the system of limestone caverns in Kentucky, USA, c1870. Wood engraving.

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