Saltpeter Cave

It is a limestone cave with 3.05 kilometres (1.90 mi) of measured length.

It has been believed, by local tradition, that niter mined from the cave was used to make gunpowder for the War of 1812, including supplying for the 1815 Battle of New Orleans.

[2] The cave entrance is gated by a "limestone block and iron bar structure, resembling a jail cell", which was built in the mid-1900s.

[2] The cave is unique in that it is a hibernaculum for the endangered Indiana Bat in the winter months.

This article about a property in Carter County, Kentucky on the National Register of Historic Places is a stub.