Subterranean Sites

An eighth-century rock-cut cave temple in the middle of Pune.

Since it formed millions of years ago, this cave system has been a sacred burial ground, a Prohibition-era speakeasy, and the center of an amusement park.

This coffee shop lies hidden beneath a historic church.

A road that winds through this natural cave is the only way to access the small, appropriately-named village of Cuevas.

Peek into a cave of giant, glimmering crystals.

Spectacular mineral formations fill these caves, which have been used for everything from smoking meat to stashing illicit liquor.

A network of underground water channels that dates back to the Middle Ages.

Nine caves filled with recently-discovered archaeological finds under the houses and the streets of the most ancient district of an old town.

Walk into an underground archeological dig, the site of the Roman Forum that was once the center of Valencia.

In a pedestrian tunnel on North Carolina State’s campus resides an expressive and artistic free-for-all.

This Roman underground canal was the longest tunnel ever built until the late 19th-century.

This tunnel was built in order to protect the village of Daroca from flash floods during rainy seasons.

The final resting place for a wealthy Roman family, this tomb might be the best preserved of its kind outside Italy.

A sprawling network of century-old subterranean catacombs lies beneath a nondescript suburban home.

This urban stream flowing underneath Tasmania's capital city is also an unofficial gallery for street artists.