Balancing rocks and ancient rock art.
Forest of razor-sharp limestone, UNESCO-listed.
Wind-carved kalut ridges in one of the hottest places ever measured on Earth.
Home of Son Doong, the world’s largest cave, plus Paradise Cave and boat trips into the river cave of Phong Nha itself.
Baltic island of rauk sea stacks and the Hanseatic walled town of Visby.
Rift-valley site of the world’s oldest parliament, where the tectonic plates pull apart.
Gunung Mulu’s vast cave system, including the Deer Cave and its nightly bat exodus.
Rainbow-striped Andean valley of adobe villages in Argentina’s far northwest.
Monasteries atop soaring rock pillars.
Drift between the American and Eurasian tectonic plates in gin-clear glacial water.
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