Underground

In 1888, a resident of Xagħra, Malta, discovered a small underground chamber filled with stalactites and stalagmites when digging a well.

According to legend, after Hades pulled Persephone into the underworld, one of her attendant nymphs cried so much that her tears formed this spring.

A former smuggler's haven houses "The Chapel" and its mysterious carvings.

Erosion has transformed this sandstone boulder into a massive dune-filled cavern.

A 4th-century Roman church complete with a hidden underground cave.

Direct access to a gold mine showing the boom and bust of Australia's Victorian gold rush.

A haunted slate mine turned concert hall and a hidden fairy garden.

An underground spring in a labyrinthine cave system, decorated with stalagmites and stalactites.

After 400 years of being closed to the public, this monastery's underground tunnels and secret garden are now a museum.

Nicknamed the 'Chestergate Hotel,' the underground tunnel had beds, lights, and even flushing toilets.

Once a passageway that led to the Shaniwar Wada palace fort.

The spectacular geological formations make it one of the most impressive caves in Europe.

A network of ancient tunnels and vaulted chambers with mystical Buddhist reliefs, built for ascetic training.