This Roman quarry once held secret masses and smuggler's contraband and is now home to rare species of bats.

The legendary cliffside castle of three-time Voivode of Wallachia, Vlad the Impaler.

Moss and stone turn this waterfall into an otherworldly liquid veil.

Seventeen oak trees sprout from the roof and walls of this tiny chapel without any visual evidence of roots.

There's a labyrinth of manmade tunnels stretching for over an acre beneath Bristol.

Perhaps the only prehistoric monument with its very own public bus stop.

What was once England's second-richest abbey is now a haunting ruin.

This quaint mortuary chapel hides a stunning Celtic Revival and Art Nouveau interior.

These ruins reveal the remarkably intact layout of a Roman marketplace.

An ancient Egyptian temple sits within a modern European museum.

A rare wooden coffin set vertically into the Gothic arch of an ruined church.

England’s ancient oak tree has such an impressive girth, people have been hosting parties within the hollow trunk for centuries.

The Virginia home of one of the signers of the Declaration of Independence is being preserved with a unique glass facade.

Mexico's largest collection of masks is found in the ruins of an abandoned convent.

A replica of the decorated wooden pillars Viking sailors threw overboard when finding new places to establish a settlement.

Stunning ruins of what was once the center of one of the greatest empires in East Africa.

In this African village, the walls of the chief's compound are painted with beautiful traditional designs.

A 600-year-old mini shrine guarded by a sword-wielding knight hides in a crumbling cliff face.

St George's Leprosy Museum depicts the gruesome afflictions of those suffering from the disease.

Across the Pacific in a raft, a museum dedicated to Thor Heyerdahl's now legendary expedition.

A reconstructed farm shows what life was like in Norway 1,500 years ago.

These mysterious 1,000-year-old walls have revealed little about their past.

There's a labyrinth of medieval chambers hidden deep below a 15th-century pub.

The abandoned fishing village was swept right into the sea.