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Sinnett-Thorn Mountain Cave System
The Sinnett-Thorn Mountain Cave System includes rooms at various levels connected by crawlways and vertical shafts, and contains waterfalls and deep pits.
Location: Pendleton County, WV
Year designated: 1973
Please remember, National Natural Landmarks (NNLs) are not national parks. NNL status does not indicate public ownership, and many sites are not open for visitation.
Last Updated: June 28, 2012