Massive puppet-automaton machines created by French artist collective Machines de l’Ile.

A once drab public housing estate is transformed into a colorful gallery of trompe l’oeil murals.

The largest crypt ever constructed in France was built in the 11th century on an ancient Druid sacred site.

A mosaic-tiled house built by graveyard sweeper Raymond Isidore.

The famous winding walk at Chartres is surrounded in mystery and myth.

The remains of this ornate chapel now act as a portal to a cramped French cemetery.

The opulent home that inspired Tintin's Marlinspike Hall and the adventures within.

Miles of man-made caves and tunnels are currently used for cultivating mushrooms.

Artist and musician Will Menter creates musical sculptures.

A 2017 crowdfunding campaign saved this historic castle from being destroyed.

A huge Megalithic chamber tomb located behind a cafe.

Ivy-covered Medieval tunnels cut through this charming town in France's Loire Valley.

Peeing dogs guard the Roman hunting goddess atop a fountain at France’s Château de Fontainebleau.

This stunning French estate was so lavish that it landed its original owner in jail for the rest of his life.

Limestone grottoes turns everyday objects into stone.

Sacked by Vikings, blessed by William the Conqueror, dealt a fatal blow during the French Revolution—these ruins have seen it all.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

One of the most important yet well-hidden museums dedicated to the history of medicine.

Rome's semi-secret peephole vista is also a former Crusader stronghold.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

A larger-than-life house of cards stands outside the house of a former fashion designer.

This poignant art installation raises awareness of violence against women.

One of the world’s smallest bars, just 13 square feet, is brimming with speakeasy flair.

This banal Parisian entranceway is not what it seems.