(01 of12)
Open Image ModalSALA SILVER MINE HOTEL\r\nSala, Sweden\r\n\r\nThis hotel has only one room—The Mine Suite—situated in what used to be an operating silver mine.
(02 of12)
Open Image ModalSALA SILVER MINE HOTEL\r\nSala, Sweden\r\n\r\nAt 509 feet underground, it\'s the world´s deepest bedroom, and it feels like it: The cave contains winding galleries; huge, water-filled caverns; and full-on lakes. You\'ll want to bundle up for the guided tour of the cave (underground temps hover around 35 degrees) but the suite itself is comfy—it\'s heated, and the bed is piled with thick covers.
(03 of12)
Open Image ModalKOKOPELLI’S CAVE BED AND BREAKFAST\r\nFarmington, New Mexico\r\n\r\nHide out in this one-bedroom cave home, carved deep into a 65 million-year-old sandstone formation.
(04 of12)
Open Image ModalKOKOPELLI’S CAVE BED AND BREAKFAST\r\nFarmington, New Mexico\r\n\r\nAt your disposal once you check in: a waterfall shower, Jacuzzi, T.V., and (above-ground) views of the Four Corners states (Arizona, New Mexico, Utah, and Colorado).
(05 of12)
Open Image ModalMUSEUM HOTEL\r\nCappadocia, Turkey\r\n\r\nHistoric in-room touches—an 80-year-old spinning wheel, a built-in oven pit, 18th-century silk ikat prints—round out the décor at this boutique property in Cappadocia.\r\n
(06 of12)
Open Image ModalMUSEUM HOTEL\r\nCappadocia, Turkey\r\n\r\nAnd yes, these caves do have some windows. You\'ll spy views of the region\'s mountains and valleys from the hotel\'s rooms, bars, terraces, and common areas.
(07 of12)
Open Image ModalSERRIN HOUSE\r\nUrgup, Turkey\r\n\r\nThe surrounding cliffs neatly camouflage this three-building stone complex.
(08 of12)
Open Image ModalSERRIN HOUSE\r\nUrgup, Turkey\r\n\r\nHigh-design touches—like the black chandelier pictured here, by Dutch design company Moooi—give the property\'s five rooms a modern-meets-Stone-Age feel.
(09 of12)
Open Image ModalCUEVAS PEDRO ANTONIO DE ALCARCÓN\r\nGuadix, Spain\r\n\r\nOnly 23 whitewashed cave rooms make up this resort in Granada. The caves have been inhabited since at least the 15th century, when Moors took refuge here.
(10 of12)
Open Image ModalCUEVAS PEDRO ANTONIO DE ALCARCÓN\r\nGuadix, Spain\r\n\r\nToday, the apartments are outfitted with TVs and fully equipped kitchens, and a pool is open during the summer.\r\n
(11 of12)
Open Image ModalPERIVOLAS\r\nSantorini, Greece\r\n\r\nYou\'ll need a boat to land at this resort, situated atop a 19th-century pumice mine.\r\n
(12 of12)
Open Image ModalPERIVOLAS\r\nSantorini, Greece\r\n\r\nAfter arriving, set up shop in a cool, minimalist cave room (sorry, no TVs here), then head out to enjoy the resort\'s private beach and infinity pool.