Deep within Lookout Mountain, on the outskirts of Chattanooga, Tennessee, is Ruby Falls, the world’s largest underground waterfall. Accessible by a glass elevator that descends hundreds of feet into the earth, this is one of the coolest outdoor experiences you can have in the state.
The journey begins with a 260-foot descent by a glass-fronted elevator, offering a glimpse of the mountain’s interior before plunging you into the cavern. You can then join a guided tour that takes you along a paved half-mile trail past rock formations sculpted by millennia of water erosion.