Wanna see the tallest waterfall in Tennessee? Gotta ride a glass elevator deep inside a mountain first

It’s been down there since 1928

You take a glass-front elevator 260 feet straight down into Lookout Mountain, and at the bottom, a waterfall thunders inside a rock chamber that no human laid eyes on until almost a century ago.

Ruby Falls in Chattanooga, Tennessee, holds the tallest underground waterfall open to the public in the United States. The cave stays 60 degrees year-round, so it doesn’t matter when you go.

What matters is what you find at the end of the trail.

A chemist crawled through a crack and found it

Back in 1928, a chemist named Leo Lambert was drilling an elevator shaft into Lookout Mountain. He wanted to reopen a different cave as a tourist attraction.

At 260 feet down, his crew broke through rock and felt a rush of air.

Lambert squeezed through a tiny passage and found himself in a hidden cave with a waterfall no one knew existed. He brought his wife Ruby down to see it and gave the falls her name.

Public tours started in 1930.

The glass elevator ride down through solid rock

The trip starts the moment you step into the elevator.

The front is glass, so you watch the rock walls of Lookout Mountain slide past as you drop 260 feet. At the bottom, a guide takes your group along a paved cavern trail, about one mile round trip.

The path has some uneven spots and around 36 stairs broken into small sets. Plan on 60 to 80 minutes depending on the tour.

The cave can’t handle wheelchairs or strollers because of narrow passages and steps.

30-million-year-old rock formations line the trail

The cave took more than 30 million years to become what you walk through today. Stalactites hang from the ceiling.

Stalagmites rise from the floor. Both grew drop by drop as mineral-rich water worked its way through the rock.

You’ll also pass flowstone, drapery formations, and thin soda straw formations so delicate they look like they’d snap if you breathed on them.

Guides have given some of them nicknames like Dragon’s Foot, Elephant’s Foot, and Steak and Potatoes.

The chamber goes dark before the falls appear

At the end of the trail, you step into a large underground chamber. The room goes dark.

Then lights hit the waterfall as it plunges from a shaft in the rock above, and a colorful LED light show shifts across the falls and surrounding stone for several minutes.

The sound of rushing water fills the chamber and bounces off every wall.

All that water comes from rain, seeping through the limestone from the surface hundreds of feet overhead.

Lantern tours let you hear the falls before you see them

On select Friday nights, after-hours Lantern Tours take small groups into the cave lit only by hand-held lanterns. No electric lights.

The cave goes completely dark beyond the reach of your flame. You move at a slower pace and get extra time at the waterfall.

The best part is the sound. You hear the rushing water grow louder with every step before you ever catch a glimpse of it.

These tours run about two hours and are open to guests ages 10 and up.

Pick a cave tour that fits how you explore

Ruby Falls runs several tour options beyond the standard trip.

The Gentle Walking Tour gives you early access, a senior guide, a slower pace, and more time for photos. The History Tour digs into stories and legends from the cave’s nearly 100-year run as an attraction.

Families with kids can book the Jr. Caver Tour, which turns the walk into an interactive adventure. Low-sensory tours are available by advance request, and private tours need at least three weeks’ notice.

Climb the tower built from the mountain’s own limestone

After you come back up from the cave, Lookout Mountain Tower is right there waiting. Workers built it in 1929 using limestone pulled out of the mountain during elevator shaft construction.

From the upper and lower viewing decks, you can see the Cumberland Plateau, the Tennessee River, and distant mountain ranges.

Blue Heron Overlook, reachable by elevator or stairs, gives you a quieter view of the Tennessee Valley and has a special viewfinder that lets colorblind visitors see the landscape in true color.

The castle on top started as a tearoom in 1929

Ruby Falls Castle went up in 1929, designed by Chattanooga architect R.H. Hunt to look like something out of the 15th century. The builders used limestone from the same elevator shaft excavation.

The castle sits on the National Register of Historic Places. For decades, it hosted a tearoom by day and dinner dances with live orchestras at night.

Today, the restored Castle Cafe serves a casual seasonal menu inside the castle or out on its covered front porch.

Zip 700 feet through the treetops on Lookout Mountain

From March through November, the High Point ZIP Adventure sends you flying through the treetops on Lookout Mountain. The course covers 700 feet of ziplines with the valley spread out below you.

A 40-foot climbing tower has multiple routes at different difficulty levels, all with auto-belay systems.

You need to weigh between 60 and 275 pounds for the ziplines, and the adventure runs on a separate ticket from the cave tour. It’s a completely different way to see the mountain.

The first U.S. attraction to earn Green Globe certification

Ruby Falls became the first attraction in the country to earn Green Globe certification for sustainable tourism.

The park runs on solar energy, has electric vehicle charging stations, uses LED lighting, and collects 16,000 gallons of rainwater for irrigation.

Its Hospitality Center, Village Gift Shop, and Village Plaza all earned Bronze LEED designation. Conservation work focuses on protecting the cave’s natural formations and the surrounding habitat.

The state recognized the effort with a Governor’s Environmental Stewardship Award for Excellence in Building Green.

One mountain, three attractions, and a Civil War battlefield

Ruby Falls shares Lookout Mountain with two other well-known stops: Rock City and the Incline Railway. The mountain rises about 2,000 feet above sea level and looks straight down at downtown Chattanooga.

It also carries serious history. In 1863, Union and Confederate forces fought the Battle Above the Clouds on these slopes.

Today, over half a million guests visit Ruby Falls each year, and most spend two to three hours at the park between the cave tour, the views, and everything above ground.

Explore Ruby Falls on Lookout Mountain in Tennessee

You can find Ruby Falls at 1720 S. Scenic Highway in Chattanooga, right on Lookout Mountain. The park is open daily from 8 a.m. to 8 p.m. Eastern Time, closed on Christmas Day.

You need to buy timed-entry tickets online ahead of time because walk-up tickets aren’t available.

Bring a light jacket or sweater for the cave since it stays at 60 degrees, and wear comfortable closed-toe shoes with sturdy soles. The trail is easier on good footwear.

This article was created with AI assistance and human editing.

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