Clarksville Cave is a horizontal cave system with 4,800 feet (1,500 m) of passage and three entrances.
The history of Clarksville Cave is one of the longest of any cave in New York. The earliest known petroglyph found in the cave is from 1811, and a letter describing the cave was written by Teunis Houghtaling in 1818.
- "Clarksville Cave". Northeastern Cave Conservancy. Retrieved 2011-05-29.