Explore the unique underground labyrinth of Wind Cave National Park, known for its boxwork formations and one of the longest caves in the world
Explore the stunning underground landscapes of Carlsbad Caverns in New Mexico, USA
Visit Yanar Dag, the burning mountain in Azerbaijan, where natural gas fires have been burning continuously for centuries
Sea caves on the west coast with a natural rock pool where the islandโs kings once bathed.
Town beneath an active volcano.
Dripstone galleries and an underground river in the Low Tatras.
Explore hydrothermal vents, lava domes, lakes, and volcanic peaks in Lassen Volcanic National Park.
Walk lava landscapes and see active volcanic terrain in Hawaiสปi Volcanoes National Park.
Experience salt flats, dunes, canyons, mountains, and extreme desert landscapes in Death Valley National Park.
Underground cave and freshwater pool.
Twin landmark hills near Hargeisa.
Striped desert canyon walls.
Limestone caves with bats and pools.
Dramatic show cave inside the Rock.
Limestone cave with a swimmable freshwater pool on Tongatapu.
Bike to famous granite-boulder beaches.
Dunes of seven natural colours.
Vast illuminated cavern near New Athos.
Balancing rocks and ancient rock art.
Eerie "Devil's Town" rock spires.
Forest of razor-sharp limestone, UNESCO-listed.
The "Eye of the Sahara" from the ground.
Sea cave at the islandโs northern tip with anemone pools and ocean windows.
Jagged eroded sandstone ridge.
Red sandstone amphitheatres carved into the coastal plateau north of Pointe-Noire.
Striped, dome-shaped rock formations.
Tram tour through a dripstone cavern.
An underground train runs into 24 km of dripstone halls, home of the blind olm salamander.
Sacred rock outcrop over Abeokuta.
A 725-metre monolith with a face-like pattern, on the road to Abuja and on the 100-naira note.
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