In Canyon Point, Utah, Amangiri is constructed around a 164-million-year-old rock, which appears to tumble into the main pool.
In Cappadocia, Turkey, the Yunak Evleri hotel complex includes a series of ancient cave houses with furniture dating back to the Ottoman Empire.
Vaulted white-washed Apulian stone covers the pool at Relais La Sommità in the town of Ostuni in Puglia, southern Italy.
In South Africa, eco walks on the Kagga Kamma Nature Reserve visit vast formations, home to 6,000-year-old rock paintings.
A former military fort, Cap Rocat in Mallorca has lookout points converted into rooms with private plunge pools.
In Taormina, Sicily, Unahotels Capotaormina has a beach that spills out from a cave on the Bay of Naxos.
Seafood favourite Grotta Palazzese emerges from the rockface at Polignano al Mare in Puglia.
At 1,200 feet above the Pacific, the Post Ranch Inn, in Big Sur, California, is built into the ridge.
The pool at Belmond Reid’s Palace is cut into a cliff on Madeira, Portugal.
Back in Mallorca, labyrinthine paths create a Moorish-citadel vibe at Cap Rocat.
Down in southern Chile, Explora Patagonia overlooks Lake Pehoé and the Torres del Paine National Park.
The Gamirasu Cave Hotel, in Turkey’s historic Ayvali Village, was a monastic retreat during the Byzantine era.
Architects Snøhetta recreated ancient cave dwellings using 3D laser scanning at the Lascaux IV International Centre for Cave Art in France.
The Kagga Kamma Nature Reserve’s rooms have been built into the sandstone of South Africa’s Cederberg mountains.
Far to the north, in Chile’s terracotta-coloured Catarpe Valley, Alto Atacama Desert Lodge integrates into the mountainside.
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