Caves

This underwater cave in Madagascar is home to what is thought to be the country's largest fossil graveyard.

A jungle cave in Peru of unknown depths, otherworldly sounds, and strange nocturnal birds that navigate by echolocation.

The small sanctuaries lie just off the beaten path near one of Bhutan's most famous attractions.

The unique funeral practices of the Toraja can be seen here with graves carved into caves and hung off cliffs.

A network of hundreds of interconnected wineries in caves hides under the town center.

Enigmatic tombs and cave dwellings on the outskirts of a rural village.

A spiral staircase connects the limestone cave with Pembroke Castle, birthplace of King Henry VII.

The underground sanctuary of a mysterious ancient Roman religious cult contains an exquisite traditional fresco.

Hidden dwellings in the cliffsides of North Togo used by local Moba tribes to evade 18th-century slave traders.

A boat ride through utter darkness, lit only by headlamps, reveals an emerald green pool locals believe is sacred.

Craggy concrete faces are hidden in the walls of this artificial cave along the San Antonio River.

Some of England's last cave dwellers lived and worked within this huge cave.

These 40,000-year-old stenciled hands are older than the famous cave art in France and Spain.

A tiny, remote island packed with wonders both natural and geeky.

There was a top secret plan during World War II to seal a group of soldiers inside the rock.

A meditative space out of a fantasy story.