Rooms cut into cave dwellings, monastery cliffs and volcanic rock. The walls in these places are older than the idea of hotels by a few thousand years.
A former Byzantine monastery and caravanserai restored into cave rooms and stone mansions above Pigeon Valley.
Suites carved into the volcanic caldera cliff of Oia, in cave houses that were once 17th-century wine cellars.
A 17th-century Dominican monastery turned hotel, standing alone on a cliff edge between Amalfi and Positano.
A hotel carved into Cappadocia's ancient cave dwellings and fair-chimney rock, decorated with registered museum antiques.
Rooms inside the prehistoric cave dwellings of Matera's Sassi, a UNESCO-listed troglodyte settlement.
Transparent sleeping capsules bolted to a cliff face 400 metres above the Sacred Valley; you climb or zipline in, and rappel out.
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