A beautiful Greco-Roman structure houses a well once believed to have healing powers.

A mud statue stands in the dark tunnels, seeming to hold up the weight of the city above.

A 400-year-old church covered floor to ceiling in ex-voto offerings from the faithful.

The post-apocalyptic remnants of a bucolic town ruined by a plane crash.

This structure atop a craggy cliff in one of the most beautiful parks in Paris boasts an unbeatable view.

Beggars were miraculously "cured" of their fake ailments when they returned home to this 17th century Paris slum each night.

Noirish green neon marks the location of one of the oldest private detective agencies in France.

One of the last umbrella repair shops in Paris upholds the nostalgic art of umbrella making.

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.

Artistic tombs, monuments, and a beautiful "Hall of Fame" lurk inside this cemetery.

A long-buried ancient ruin unearthed right in the middle of the city.

This poignant art installation raises awareness of violence against women.

The remains of the left arm of the levitating philosopher-saint are kept in a 13th-century Neapolitan basilica.

A wunderkammer of curious objects and intriguing art nestled within a hub of ancient Roman sites.

Geometry and mystery come together in an epic show of octagonal masonry.

Southern Italy's spinning top village.

People have been living in the cave houses on this Italian hillside since the Neolithic era.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

These secluded and abandoned anti-aircraft defenses have become one the most scenic viewpoints in Barcelona.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

This semi-secret storybook hedge maze is also the oldest garden in the city.

An abandoned NSA listening post on Berlin's "Devil's Mountain."

Super-heavy Nazi architectural experiment.