Renaissance castle built into the mouth of a cliff cave, with secret tunnels used by a robber knight.
Monastic cells cut into cliffs high above the Dniester river.
Cave monastery above a river bend.
Vivid 5,000-year-old cave paintings.
Spectacular two-level limestone caves.
Karst islets, mangrove channels and Taino cave art.
Waterfall dropping through three natural bridges into a cave shaft.
Cave reef made famous by James Bond.
River cave of Maya skeletons and artefacts.
Karst caves stuffed with Buddhas amid sugarloaf mountains.
Paddle 8 km into a limestone cave where a river flows straight out to the sea โ one of the New Seven Wonders of Nature.
Dripstone galleries and an underground river in the Low Tatras.
Golden cliffs and beaches in the south.
Sea cave on the Algarve coast with a round skylight in its domed roof โ reached by boat, kayak or paddleboard.
Home of Son Doong, the worldโs largest cave, plus Paradise Cave and boat trips into the river cave of Phong Nha itself.
Drift by boat beneath a cave ceiling lit by thousands of glowworms.
Golden-domed monastery complex above catacombs of mummified monks.
Gunung Muluโs vast cave system, including the Deer Cave and its nightly bat exodus.
Drop into a limestone sinkhole of crystal-clear fresh water on the Yucatan, where the Maya saw the entrance to the underworld.
Rock-cut cave temples in Maharashtra, crowned by the monolithic Kailasa temple.
Squeeze and scramble through a wild cave system.
Hike volcanic spires, talus caves, and condor habitat in Pinnacles National Park.
Explore bristlecone pines, Lehman Caves, Wheeler Peak, and dark skies in Great Basin National Park.
Descend into vast limestone caves and desert landscapes at Carlsbad Caverns National Park.
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