One Hill Country exit drops you 180 feet underground into Texas’s largest cave

It’s bigger, older, and weirder than you’d expect

Between San Antonio and New Braunfels, a 60-foot slab of limestone sits suspended in the air over a hole in the ground. That slab is a natural bridge, and what’s below it goes down 180 feet into the earth.

Natural Bridge Caverns is the largest commercial cave system in Texas, and most people driving through the Hill Country have no idea it’s there.

Once you go in, the Hill Country above you disappears entirely.

Four college students and a cattle ranch changed everything

On March 27, 1960, four students from St. Mary’s University in San Antonio talked their way onto a cattle ranch in Comal County.

Orion Knox Jr., Preston Knodell Jr., Al Brandt, and Joe Cantu had already made three trips to the property. On this fourth expedition, they found two miles of chambers stretching beneath the Wuest family’s land.

The landowner, Clara Wuest, and her husband Harry Heidemann bet everything they owned to develop the site. The caverns opened July 3, 1964, and the Wuest family still runs the place today.

Go 180 feet down on the Discovery Tour

The original tour follows the same path those four students walked in 1960.

You descend 180 feet below the surface along a three-quarter-mile route, lit by a multi-million-dollar LED lighting system that shifts the mood of each chamber.

Guides stop along the way to explain what you’re looking at: stalactites hanging from above, stalagmites pushing up from the floor, soda straws thin as pencils, and flowstone draped over everything like frozen water.

The whole tour runs about 60 minutes.

The Hall of the Mountain King’s dwarfs a football field

The largest room in the cavern runs 350 feet long, 100 feet wide, and 100 feet high.

The floor is covered in flowstone, columns, and stalagmites, and somewhere in there you’ll find formations called “fried eggs,” stubby stalagmites capped with rings of yellow and white calcite.

They look like they belong in a kitchen, not 180 feet underground.

Other chambers go by names like the Castle of the White Giants, Sherwood Forest, and Pluto’s Anteroom. Everything looks like wax.

None of it is. It’s limestone, and it’s as hard as it sounds.

The Hidden Wonders Tour rides a conveyor belt out

A second tour takes you through a different set of chambers, 160 feet down and half a mile through formations most visitors never see. A sound and light show tells the story of how the cave formed over millions of years.

At the end, instead of hiking 700 feet back to the surface, you ride the B.A.T., which stands for Belt Assisted Transport. It’s the only conveyor system ride out of a cave in the world.

The tour runs 70 to 75 minutes, and the ride out is worth the ticket on its own.

Arrowheads and bear bones hide near the entrance

During development in the 1960s, workers found arrowheads and spearheads along the entrance trail dating back to 5,000 B.C. Just inside the entrance, they turned up jawbones from a bear species that went extinct more than 8,000 years ago.

In 2003, archaeologists from the University of Texas at San Antonio ran a formal excavation and pulled out hearths, stone tools, projectile points, and charred plant remains.

The upper chambers served as shelter long before anyone thought to call it a cave system. That archaeological site now sits on the National Register of Historic Places.

Explorers are still finding rooms nobody has ever entered

The cave isn’t finished yet. Since May 2019, a team of cavers has mapped over 1,600 feet of new passages that no human had ever entered.

In 2019 alone, they found a 600-foot corridor with mineral-rich water pools and ice-like crystal mounds. Some of those expeditions run longer than 19 hours.

In 2022, they found bones and wildcat tracks in newly opened sections.

Scientists think as much as another mile of passages could still be out there, waiting under the Hill Country.

Walk it by lantern light like it’s 1960

Once a day, the caverns run a Lantern Tour that puts you back in the year of the discovery.

You carry a handheld lantern, follow a guide, and move through a re-creation of what Knox, Knodell, Brandt, and Cantu experienced when no one knew what was down there. The shadows shift differently by lantern.

The formations look different when the only light comes from what you’re holding. Advance registration is required, and spots go fast.

Strap into a harness and get muddy on an adventure tour

If the paved tours feel too easy, you can go off-trail entirely.

The adventure tours outfit you with a rope harness, helmet, and headlamp, then take you into the undeveloped sections of the cave.

The Discovery Adventure Tour involves hiking, climbing, sliding, and squeezing through sections narrow enough to feel your heartbeat.

The St. Mary’s Adventure Tour, named for the university where the original discoverers studied, teaches roping and rappelling skills. Experienced guides run both, and you will come out dirtier than you went in.

Six stories of ropes, rails, and a 5,000-square-foot maze wait above ground

When you come back to the surface, there’s still plenty to do.

Twisted Trails is a six-story ropes and zip rail course with 685 feet of suspended track and 50 obstacles across four levels.

When it went up in 2020, it was the largest outdoor combined Sky Trail and Sky Rail attraction of its kind.

A 5,000-square-foot outdoor maze lets visitors race to find checkpoints, and the Natural Bridge Mining Company gives you a flowing water sluice to pan for gems, fossils, and arrowheads. Younger kids get their own scaled-down ropes course.

15 million bats pour out of a nearby cave every summer evening

A few miles from the caverns sits Bracken Cave, and every summer evening, more than 15 million Mexican free-tailed bats spiral out of it in a cloud on their nightly insect run. It is the largest bat colony in the world.

Natural Bridge Caverns runs Bracken Bat Flight packages from May through September, in partnership with Bat Conservation International.

The evening starts with activities at the caverns, then you drive over to watch the flight. Nothing in a travel brochure can prepare you for the scale of it.

The Wuest family has run this place for over 60 years

Clara Wuest Heidemann didn’t just open a tourist attraction. She built something that has lasted three generations.

The Heidemann-Wuest Foundation she established supports charities focused on youth, education, wildlife conservation, and veterans.

The family keeps investing in exploration and new experiences, and the cave keeps rewarding them.

In December, carolers sing underground during Christmas at the Caverns, and a trail of lights runs through the property.

The underground ballroom, the deepest event venue in Texas, hosts concerts on select dates through the year.

Explore Natural Bridge Caverns in the Texas Hill Country

You can start planning your visit at the official website, where tour times and availability for the Lantern Tour and adventure tours are posted.

Natural Bridge Caverns sits at 26495 Natural Bridge Caverns Road, about 30 minutes north of downtown San Antonio via I-35 in Comal County. The caverns open daily year-round, with a handful of holiday closures.

Combo tickets cover both cave tours.

Bracken Bat Flight packages run May through September and sell out early, so book those well ahead of your trip.

This article was created with AI assistance and human editing.

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