Caves of the USA
Raw file: Caves_of_the_USA.gpx (120.62 KB)
It's advisable to call ahead since many caves are seasonal or closed for one reason or another.
I've tried to eliminate the Guano mines. Some are pretty rugged but check Wikipedia or the phone numbers.
These POI's have an reference image in the information tab (i) on the GPS. If you touch it it will expand. (Thanks to turboccc for his EPE)
To learn more go to Wikipedia. These caves are really fascinating.
skoville - Jan 4, 2014
Added Largest Caverns in the USA