Known as the "Gateway to Red River Gorge," Nada Tunnel is the most intriguing ... If you have an SUV or a bigger car, double-check that you can clear the tunnel before proceeding.

One of their coolest tours is the "Red River Gorge Underground Cavern Glow," which ... There's the option to have a single or double clear kayak, too — in case you don't want to go it alone.