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

If they push on just the right spot, even the weakest person can move this titanic boulder.

A unique underground structure dating back to the 1st century BC.

The construction of a tram line unveiled hidden remnants of the old medieval city.

The approximate spot where the last Grand Master of the Knights Templar was put to death.

Hundreds of dwarf beeches create an unusual, haunting forest in the north of France.

The birthplace of the ferocious William the Conqueror, this castle is awash in medieval history.

The Church of the Annunciation was carved into the face of a cliff, just like the rest of the town of Haute-Isle.

These crumbling Nazi artillery bunkers are now fair game for massive graffiti projects.

A centuries-old complex of hand-dug stone chambers has sheltered locals in times of trouble.

With a history of slaughter, feast, and famine, remnants of the pork industry decorate this area--even its church.

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

The remaining relics of the patroness of Paris lie in a chapel under a striking double spiral staircase.

An isolated 17th-century chapel on a remarkable site once dedicated to Celtic sun worship.

Trek into the depths of the cave where 17,000-year-old paintings exist alongside 400-year-old graffiti.

Hundreds of prehistoric stones, arranged in perfect lines in a French field.

Nicknamed the "Museum of Horrors," this French anatomical collection has been fascinating visitors for over a century.

The 16th-century church was kept in its ruined state as a reminder of the casualties of World War I.

This ancient theater was once the home of fierce gladiatorial battles.

Hundreds of secret cabinets built into the walls of legendary poisoner's private work room.

A self-built mosaic house and sculpture park.

An ancient monastery, a locked room, and a mysterious book heist.

A medieval church with largest and oldest collection of Renaissance frescoes in France.

This French castle is said to have once held the Holy Grail but is now a gorgeous mountaintop ruin.