For $2.75 million, you can be a posh caveman.

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PARTHENON, Ark. — In an Ozark crag in north Arkansas, one of the country’s most high-maintenance homes — a cave tucked into a natural cavern — is gussied up and back on the market. Again.

The three-year, million-dollar renovation is the latest in a series of makeovers for the Beckham Creek Cave, which has passed through numerous hands since it was built as a bomb shelter in the early 1980s. The fully furnished cave and its 257 acres can be yours for just $2.75 million.

Today, the cave home is a carefully epoxied science-fiction bunker of rock walls, smooth concrete surfaces, black steel and stalactites. Still, moisture is a menace, so the newest renovation includes improved waterproofing. Two high-capacity geothermal units control the cave’s dampness and keep the year-round temperature a cool 65 degrees.

“We tell people to wear your sweats,” said the broker, Rayne Davidson. “You’re in a cave.”

It comes with four bedrooms and four baths, 5,500 square feet of living space, a spring-fed pond, rainy-season waterfall, a view of bluffs, helicopter pad, and a grand room anchored by a rock waterfall called the Spanish Piano. The back door accesses a “live cave” that extends more than a mile into the earth. This winding, undeveloped portion of the chasm is home to reptiles and rare bats.

The bat cave home is a millionaire’s retreat without all the supervillain stress. Still, it has had plenty of drama.

John Hay, co-founder of Celestial Seasonings who lives in Colorado, built the home for about $1 million out of anxiety during the Cold War.

Friends from Arkansas brought him to the cave.

“We built it out figuring if something was going to happen we’d have a place to go,” Hay said in a recent phone interview.

He replaced the outer cave wall with 2-foot thick cinder block, and installed a drinking water aqueduct and hydroelectric plant.

By the time the cave was finished, glasnost made it seem obsolete.

“I didn’t know what to do,” he said, “so I thought I would make it into a Hollywood home, and see if I couldn’t sell it for a decent price.” Upgrades included a “Fred Astaire dance floor” in the great room.

He succeeded, selling it in 1988 to a Missouri millionaire who reputedly threw lavish parties. Locals called the place “the mullet,” according to the current housekeeper Sherill Ricketts, who attended several of the blowouts over the decades. “It looked all business in front but it was a party in back.”

Since then, the cave home changed hands and shape several times. For a while, Beckham Creek Cave operated as a resort, with rooms for up to $1,000 per night. The latest owner defaulted on his loan, transferring the cave to Houston investors.

They brought in Zach Lee, an interior designer from Harrison, Arkansas.

“It was the nastiest place I’d ever been,” he said.

Someone had installed carpet and drywall, which were rank from the moisture. Mold remediation alone cost $20,000. Dated tile floors, brass fixtures and bidets needed removal.

Complicating everything was the fact that a cave has no straight lines, no right angles.

“It was almost impossible to measure anything,” Lee said.

Every point was a different measurement.

They reduced the loft over the kitchen to open up the grand room to more natural light. Stained concrete floors work with the natural texture of the cave while resisting moisture. Lee softened the look with cedar doors and headboards of repurposed barn wood, locally sourced. And he installed a honeylocust wet bar with a live edge, cut from the property.

In the bedrooms, crews installed rubberized membranes behind wooden slats on the ceilings and walls to prevent drips. New French drains usher water away.

Still, the cave lives. Inside, the sound of rushing water is omnipresent. As Davidson gave a recent tour, she dodged a falling water drop, “There’s a drip,” she said. Small puddles still form under some stalactites.

Davidson said interested parties view it as a getaway or a lodge that might serve future nearby cabins. The trick is getting people to visit.

“They almost always say the pictures did not do it justice,” she said. “You just can’t capture the energy of it — the vastness of it.”