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.
Golden-domed monastery complex above catacombs of mummified monks.
Home of Son Doong, the worldโs largest cave, plus Paradise Cave and boat trips into the river cave of Phong Nha itself.
Sea cave on the Algarve coast with a round skylight in its domed roof โ reached by boat, kayak or paddleboard.
Gunung Muluโs vast cave system, including the Deer Cave and its nightly bat exodus.
Rock-cut cave temples in Maharashtra, crowned by the monolithic Kailasa temple.
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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