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.
Year designated: 1973
Please remember, National Natural Landmarks (NNLs) are not national parks. NNLs are owned by a variety of public and private entities and allowing visitation is at their discretion. Many NNL sites maintain public websites where additional information may be found.