Somewhat notorious since being put up for sale on eBay, this cave dwelling is unique in all kinds of amazing ways – not least of which for the fact that it currently contains a curious hybrid home with a natural stone roof, modern infill walls and assorted antique furniture and furnishings. But watch out: sand falls from above, so umbrellas are mandatory for kitchen and dining spaces.

Before its time as a hybrid-style home, this historic locale played host to famous 1980s rock singers (who performed on a still-extant underground stag) as well as a now-defunct 1950s roller rink. Today, it still sits on multiple acres of picturesque rural land and features fourteen waterfalls … as well as the 17,000 square feet of livable underground cave space.

Geothermal energy provides power, heating and cooling during much of the year – making bills a fraction of a typical (much smaller) home. A living area sits in front, with bedrooms lofted above to also access natural light. A huge recreation area that requires fully artificial lighting is located in the back. In between are service-oriented spaces including storage and laundry rooms. Despite these clearly clever design choices, there is something enchanting and organic about the casual, nearly-haphazard way everything fits together inside this strange cave house.

This unusual home recently went up for sale. Check out this info via St. Louis Magazine:

“The listing for the property in Festus, Missouri, starts off like any other real-estate listing—and then it gets interesting. That’s because the whole home is built inside a 17,000-square-foot cave. Owners Curt and Deborah Sleeper found the man-made cave on eBay in late 2003 and spent the next four years constructing a 5,000-square-foot house inside. Now, real-estate agent Rhonda Overberg says the Sleepers are ready to downsize, and the 2.91-acre property is on the market for $349,900.”