Gallery: Under Mountains by Denny Nelson

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Speleologist Denny Nelson has been exploring the underside of West Virginia since the 1970s, during which time he's helped catalog thousands of caverns. A native of Randolph County, Nelson has grown up amid cave and karst.

More about the photography of Denny Nelson

Denny's love for West Virginia and its spectacular underworld comes through in his photography, much of which includes portraiture of cavers he leads on adventures into the subterranean world. Many of his photos are also featured in our . Visit Denny at his profile page for more information on caving in West Virginia.