The Coolest Caves in the U.S. You Can Actually Visit
Leave your fear of the dark at home.
For outdoors enthusiasts, it can sometimes feel like everything’s been done—every trail has been hiked, every mountain has been summited, and suddenly, you’re considering taking up an indoor hobby like knitting. But wait! Instead of ascending peaks, now may be the time to consider descending below the surface.
There are an estimated 45,000 caves in the contiguous US alone—including the longest cave system on earth—meaning there’s really no limit to the number of underground passageways available for you to enjoy… so long as you’ve conquered your fear of the dark and your claustrophobia. Here, we've picked out some of America’s coolest caves, all ripe for exploration. Happy spelunking, and don't watch The Descent before you head out. (Trust us.)
Mammoth Cave National Park, Kentucky
This UNESCO World Heritage Site is the longest cave system in the world with 400 miles of explored caves. Both guided and self-guided tours are available year-round, with scenic routes ranging in difficulty from relatively easy to ultra-challenging. The multitude of guided tours highlights some of the cave’s most iconic features: The Historic Tour visits the historic areas that originally made Mammoth Cave famous, while the Cleveland Avenue Tour, fit for geology nerds, takes you through sparkling walls of gypsum. Bonus: If you happen to visit when it's storming outside, you may even see a layer of fog form inside the cave. Very eerie.
How to visit: Tour availability varies by season. Tickets start at $9 for kids and $11 for adults.
Some caves feature underwater rivers, lakes, or waterfalls, but Devil’s Den Spring is a full-on dive site. It was formed by a karst window—essentially, a cave roof that collapses, revealing a prehistoric underground river. (The result looks similar to a cenote.) Divers can view ancient stalactites and fossil beds dating back 33 million years through the crystal-clear, brilliantly blue water, which reaches maximum depths of 54 feet and maintains a steady temperature of 72 degrees Fahrenheit year-round.
How to visit: Scuba diving is offered seven days a week with proper certification, no reservations necessary (unless you plan to take a night dive). Every diver must have a dive buddy. Admission is $38 per diver, and rental gear is available. Snorkeling is also available by appointment only; admission starts at $18 per person and rental equipment is available.
With more than 6,400 recorded caves—though only 20 are open to the public for guided tours—Missouri is known as the "Cave State." Meramec Caverns is the largest and most well-known system of the bunch, thanks to its location along historic Route 66, its notoriety as a former hideout for outlaw Jesse James and his gang, and its heralded past as a stop along the Underground Railroad. These days, it's outfitted with neon signs, multicolored mood lighting, and manmade props along well-lit guided tour routes. Meramec's 150,000 annual visitors can expect to see an ancient limestone Wine Table (which they call the "world's rarest cave structure") and a seven-story "mansion" built underground.
How to visit: Tours are offered every 20 minutes daily starting at 9 am. Tickets range from $14 for children ages 5 to 11 to $27 for adults.
Custer, South Dakota
There are so many cool things to see above ground in the Black Hills of South Dakota that you’d never expect there to be just as many cool things to see beneath the surface. Well, surprise! Jewel Cave, designated a national monument in 1908, has more than 180 miles of mapped and surveyed passageways, making it the third-longest cave system in the world. The cave delivers on its name, with large calcite crystals covering the walls and ceilings that look like dripping jewels. (There’s also a 10-foot-long piece of flowstone called “cave bacon.") You can take one of three different guided tours through the caverns ranging in difficulty from easy to strenuous.
How to visit: The tour schedule varies by season. Advance reservations are highly recommended. Tickets start at $3 for kids and $9 for adults.
Hot Springs, South Dakota
The world’s first-ever cave to be designated a national park, Wind Cave (so named for the whistling wind ever-present at its entrance) is one of the longest and most complex systems on earth. Home to 95 percent of the world's boxwork—delicate, web-like cave formation that remains one of the park’s many mysteries—visitors can explore Wind Cave through ranger-led tours. Check out the magnificent wildlife that surrounds the caverns, including bison, elk, and prairie dogs, before delving underground for even more natural wonders.
How to visit: Advanced tickets may be purchased, but additional same-day tours are on a first-come, first-served basis. No self-guided exploring is permitted. Ticket prices start at $4 for children 6 to 15 and $7 for adults.
Some 400 million years in the making, the Luray Caverns in Virginia's Shenandoah Valley are the largest, most popular caverns in the eastern US. Each year, half a million visitors come to see the system’s dramatic underground rock formations, with guided tours that take you through Giant’s Hall (billed as "Geology's Hall of Fame") with its towering Double Column, Frozen Fountain, Dream Lake, Saracen’s Tent, and Titania's Veil. Here, you'll also find the Great Stalacpipe Organ—the largest musical instrument in the world, which uses electronically controlled rubber mallets to gently tap the cave's stalactites, turning three acres of the cave into a music hall.
How to visit: Tours are offered daily from 9 am to 6 pm. Tickets are $16 for kids ages 6 to 12 and $32 for adults.
Carlsbad Caverns National Park, New Mexico
If you’re worried about overheating in New Mexico’s Chihuahuan Desert, rest assured: Things cool down quick inside the 100+ millennia-old limestone caves that make up Carlsbad Caverns National Park, which you can explore on a self-guided tour or a ranger-led tour for an additional fee.
The 357,480-square-foot Big Room—the largest single cave chamber in the US—is the most popular cave, drawing some 300,000 visitors each year. Other areas, like the Hall of the White Giant and the Spider Cave, require crawling. If you're visiting between May and October, stick around for the Bat Flight Program, when hundreds of thousands of Brazilian free-tailed bats exit the cave at dusk to forage for food.
How to visit: You’ll need to make a reservation online at a cost of $1 per ticket prior to your visit and purchase an entry pass upon arrival in the park. Kids under 16 get in free, while adults must pay a fee of $15 per person.
Inside Craighead Caverns, you'll find the largest non-subglacial underground lake in the United States (and the second-largest in the world!), known as the Lost Sea. On the Lost Sea Adventure, visitors can explore during the day or choose to spend the night deep underground as they venture through undeveloped cave rooms and squeeze their way through some very tight spaces. The cave also features an underground waterfall and anthodites (aka "cave flowers"), a unique geologic structure so rare, the Lost Sea contains 50% of the world's known formations.
How to visit: Reservations are required two weeks in advance for the overnight Lost Sea Wild Cave Tour, with a minimum group size of 12. Tours start at $47 per person.
Kartchner Caverns is a 2.4-mile system of underground passageways located in southeastern Arizona. Visitors to Kartchner Caves can choose from several different guided tours, where they may spot the 58-foot Kubla Khan, the largest underground column formation in Arizona; the world’s longest soda straw stalactites; or the 1.2-acre Big Room, which is home to the world's most extensive formation of brushite moonmilk, a milky white cave deposit. Note that the Big Room is closed each summer, as it is a nursery roost for over 1,000 cave bats.
How to visit: No self-guided tours here, but you can book any tour in advance, and reservations are strongly encouraged. Tours are $13 for kids ages 7 to 13 and $23 for adults.
Howes Cave, New York
Located in the tiny hamlet of Howes Cave in upstate New York, Howe Caverns and neighboring Secret Caverns both offer tours of underground wonderlands with stunning water features… but that’s just about where the similarities end.
Howe Caverns features a boat ride along the calm, glassy surface of an underground lake, while Secret Caverns has a thunderous 100-foot underground waterfall. Howe Caverns offers a more structured experience, while the vibe of Secret Caverns answers the question, “What if your woo-woo aunt who’s lived in an artist commune since the ‘70s decided to buy a cave and make it a tourist attraction?” Whichever you choose will be extremely worth your time and money, and since they’re right next to each other, we recommend hitting both.
How to visit: Howe Caverns has several tour options—including traditional tours, adventure tours, and specialty tours including overnight stays—some of which must be booked online in advance. Prices start at $15 for children 5 to 12 and $25 for adults. Secret Caverns offers one standard tour; no reservations are available, and it’s cash only. Tour availability varies by season.
San Antonio, Texas
As the old adage goes, everything is bigger in Texas. Naturally, that includes the Natural Bridge Caverns, the largest commercial caverns in the country. Named for the 60-foot natural limestone bridge near its entrance, Natural Bridge offers a few different kinds of tours, one of which—the Adventure Tour—will have you crawling through narrow passageways to see undeveloped cavern rooms. (Yes, you will be covered in mud, and it's a glorious experience.) This is also the home of the world’s largest bat colony, which visitors can witness during the summer months when millions of free-tailed bats come whizzing out of the cave at dusk for their nightly food foraging.
How to visit: Prices vary daily but generally start at $17 for children and $25 for adults.
Lookout Mountain is home to some extremely popular Chattanooga attractions, including zip lines and a century-old limestone castle—but there’s no denying that the main draw is 145-foot Ruby Falls. You’ll descend 260 feet underground in a glass-front elevator and spot ancient formations along the cavern trail before laying your eyes on the thundering falls, lit up by color-changing spotlights. On special after-hours tours, you can also try a descent illuminated only by handheld lanterns.
How to visit: Timed entry tours must be booked online in advance. Tickets start at $14 for children 3 to 12 and $25 for adults.
Gifford Pinchot National Forest, Washington
Formed 2,000 years ago when Mount St. Helens erupted, the Ape Caves are the longest continuous lava tube in the continental US, stretching along beneath the earth for more than two miles. The cave is open all year—but keep in mind that the temperature inside tends to sit at 42 degrees Fahrenheit same-day year-round, and the walls are slick with water and "cave slime."
The Upper Cave is more rugged and challenging, with a slick 8-foot lava fall you’ll need to scale and some tight spaces to squeeze through. The Lower Cave—a broad tube with a flat floor that descends gently—is much easier to navigate. While making your way through the latter, keep an eye out for the formation called The Meatball, a blob of lava rock that fell from the ceiling as the tube was forming and petrified, creating a rather intimidating archway.
Moaning Cavern is home to the largest public cave chamber in the state of California, a cavern tall enough to fit the Statue of Liberty from toes to torch. Visitors will descend 65 feet underground to check it out (and cardio champs can head further down the century-old, 100-foot spiral staircase to stand at the base).
This is also home to some of the oldest human remains ever discovered in America: 13,000-year-old bodies belonging to prehistoric people who, whoops, likely slipped and fell into the cave's opening. Allegedly, the moaning sounds for which the cave is named are caused by water dripping into holes on the cavern floor… but history considered, we’re gonna guess the sounds are actually ghosts.
How to visit: The Spiral Tour is offered daily at the top of every hour. Tickets start at $23 for ages 12 and up and reservations are highly recommended. The three-hour belly-crawling Expedition Tour is offered by reservation only. Tickets are $130 for ages 12 and up.
Pigeon Mountain, Georgia
Guided tours a little too soft for you? Located inside Ellison's Cave—a pit cave found on Pigeon Mountain in northwest Georgia—the Fantastic Pit is everything your hardcore heart desires. Grab your helmet, your harness, and your “critter,” and get ready for the deepest free-fall pit in the Lower 48 at 586 feet deep. The Fantastic Pit is big enough to hold the Washington Monument (555 feet tall) and is nearly twice the height of the Statue of Liberty (305 feet tall). This cave system is only for seriously experienced cavers; there have been several fatalities here, most due to hypothermia from getting stuck in the cold, wet environment, so proceed with caution.
How to visit: This one is about as self-guided as it gets, but it is NOT for beginners or casual explorers, basically anybody who didn't already know that “critter”—a.k.a. CRITR—refers to a rappelling device). Hit all the other caves on this list, and then come back to give this bad boy a go.