For you adventurous souls who like to get your sightseeing thrills underground, California has a wealth of caves open to the public â offering everything from walking tours to mud-caked spelunking. Yet subterranean tourism isnât as new a concept as you might assume.
Hidden in the foothills of the Sierra Nevada, California Cavern became the first cave to open to the public in the state in the 1850s. Itâs still operational 170 years later, and its unique sights are as astonishing now as they were to those first visitors.
A rock formation in California Cavern (Carly Severn / KQED)
An elaborate network of tunnels and yawning crystalline chambers awaits 80 feet below the earth. The network stretches underground for two and a half miles, giving it the distinction of the stateâs longest cave system.
âItâs really just a different world,â says Andrew Kilbreath, a California Cavern tour guide whoâs been guiding visitors in the cave for 17 years.
California Cavern tour guide Andrew Kilbreath (Carly Severn / KQED)
Down in the caverns, itâs 53.8 degrees 365 days of the year â so stepping through the gate on a hot summer day can feel like heaven. In winter, steam rises from the caveâs mouth, giving it a somewhat more hellish appearance.
Much of California Cavernsâ early history is shrouded in mystery. The indigenous Miwok people were said to have used the caverns as a jail, and there are rumors that a Spanish helmet was once found inside.
In 1850, a prospector named Captain Joseph Taylor was passing the time with target practice on the rocks above when he suddenly felt a rush of cool air on his skin. It was coming from a hole that lead to the caverns he had no idea were gaping underneath his feet. Thrilled by the notion heâd stumbled upon a secret goldmine, Taylor returned the next day with gunpowder and blew the hole wide open to expose the caveâs entrance.
A passageway in California Cavern (Carly Severn / KQED)
The caverns he found were marble, not gold â but the underworld Taylor had rediscovered immediately captured the public imagination.
âIt gave him the idea of charging a pinch of gold dust or a couple of coins and giving candlelit tours â starting this off as the very first commercialized cave in California,â explains Kilbreath.
Finding himself one of the stateâs first tourism entrepreneurs, Taylor shrewdly dubbed the caverns Mammoth Cave, after the famous Kentucky cave systems that were drawing attention all over the United States. Afledgling town sprung up around this new tourist attraction, and became known as âCave Cityâ â a name the caverns eventually took too.
Overhanging rock formations in California Cavern (Carly Severn / KQED)
Throughout history, humans have always been thrilled by the idea of underground worlds, and when it opened to the public, Taylorâs cave was a monster hit.
âNo powers of description can convey an idea of the immensity of this cave, the grandeur of its lofty columns and fretted domes, and the elegance of the designs,â wrote the Calaveras Chronicle in 1854. They described it as a place âwhere nature exhibits how far her handiwork transcends the most exquisite productions of man.â
In an act of, what Kilbreath calls, âhistorical vandalism,â those first visitors were encouraged to etch their names onto the cavern walls. The litany of signatures â carved into the rock with a steel nail, some crude, some elegant â may appall us today, but itâs one of the reasons California Cavern is now considered a state landmark.
On rare occasions modern visitors have found the names of distant relatives marked on these rocks, says Kilbreath.
One of the most notable features of California Cavern are the underground lakes. These foreboding pools of dark water fall away into the blackness. But when you hold a light to them, the water is revealed to be crystal clear. During the flood season, unless you hear the bubbles softly rising, itâs easy to step straight into the water without even realizing.
An underground lake in California Cavern. (Carly Severn / KQED)
When deemed safe, California Cavern opens the lakes to tour groups, who raft or swim across them. While Kilbreath says itâs âpretty neatâ to be able to say you swam in an underground lake, itâs also âa little creepy knowing there’s 80 feet of pitch black water below you.â
When the caverns first opened, writers like Mark Twain and Bret Harte paid a visit. John Muir visited in 1876, and later wrote how the caverns were âall a-glitter like a glacier cave with icicle-like stalactites and stalagmites combined in forms of indescribable beauty.â
Above ground, the small town of Cave City that sprung up around the cave mouth in the 1850s began to develop an unusually close relationship with the underground world that stretched below them. First, the townspeople built a hotel at the entrance. Then the town itself began to spill down into the caverns.
A formation known informally as “cave bacon” in California Cavern (Carly Severn / KQED)
They built a saloon where prospectors and visitors alike could swig their whiskey under sheets of solid rock. (âThe bad joke for that: It’s the cavern tavern,â says Andrew.)
Deeper inside, in a domed vault they called âthe Bishopâs Palace,â the people of Cave City built their church, complete with an organ. Stepping into this hushed space, itâs hard not to imagine how angelic those services must have sounded.
The Bishopâs Palace was named for a pillar of rock the people of Cave City thought resembled a Roman Catholic bishop wearing robes â illustrating how 80 feet underground, the human eye seeks out familiar shapes and patterns like it does when faced with clouds.
A formation that resembles jellyfish in California Cavern (Carly Severn / KQED)
Rock formations known as ‘flowstones’ look like frozen waterfalls â they’re created by mineral-rich water dripping down the cave walls and depositing calcite. Pillars of rock looks like human figures, and elsewhere formations look like jellyfish, dinosaurs, even monstrous faces.
âIf you do have a good imagination you can spend hours down here staring up at the ceiling,â says Kilbreath.
Today, our subterranean sightseeing is enabled by the colorful artificial lighting that bathes California Cavern. Itâs the kind of illumination that, if it hadnât been for Captain Taylorâs curiosity, would never have been brought down here.
The idea that the caveâs beauty was previously âshrouded in darkness all the timeâ is something that particularly strikes Kilbreath each time he visits the caverns.
âIt’s kind of a weird way of thinking about how much beauty is down here but not really ever meant to be looked at,â he says.
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