3. The naturally formed Sand Cave in Cumberland Gap offers an unusual, yet amazing view of where ancient Kentuckians might have lived. Cumberland Gap is also home to the 2400 foot pinnacle where one can view Kentucky, Tennessee and Virginia simultaneously.
"It's in Cumberland Gap National Park, right at the conjunction of Kentucky, Tennessee, and Virginia. The cave is on the North side of a ridge. The ridge itself is the state line between Kentucky and Virginia. The cave is on the Kentucky side. If you go to Ewing, Virginia, there's a trailhead at a place called "Civic Park"." -- Philip Putnam