Clarksville Cave is a cave in Clarksville, Albany County, New York. Clarksville Cave is a horizontal cave system with 4,800 feet of passage and three entrances.
Wikipedia https://en.wikipedia.org/wiki/Clarksville_Cave
More information on showcaves.com http://www.showcaves.com/english/usa/caves/Clarksville.html
Address 2080 Delaware Tpke, 12041, United States
Coordinates 42°34'33.686" N -73°57'56.16" E