Fur-lined metal pod dangling in the French countryside.

Deep in the limestone cliffs of the Alabaster Coast, a German fortress built during World War II.

Every half hour, the flow of this unusual spring cycles between a rush of water and barely a trickle.

Explore an eerie, abandoned medieval citadel.

A unique military outpost carved into a rocky outcrop in the English Channel.

A massively oversized measuring tape sculpture sits inside a hidden yard.

The experimental test tracks of a retro-futuristic monorail still stand in the French countryside.

A fortified palace in the shape of a ship on the Thiou river.

A functioning Roman-era aqueduct and bridge in rural southwest France.

The ruins stand as a somber reminder of France’s worst civil catastrophe of the 20th century.

A resort destroyed by a mysterious bombing offers visitors only its remains and the riddle behind it's demise.

This bunker in northern France was built by Nazi German forces with the intention of launching up to 50 V2 rockets at London each day.

Europe's largest community of crocodiles and alligators.

This miniature Paris, built out of trash, is one man's two decade labor of love.

This Corsican Neolithic site is full of pre-Roman megalithic structures that may or may not be penises.

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

Half a century after it was abandoned, this ghost town is coming back to life.

A suspended footbridge allows for traversing this gorge carved through the French Alps.

The haunting concrete remains of a Nazi pebble crusher can still be found in this small French commune.

A total of 22 tiny bridges cross this canal of the Yvette River, forming a unique trail.

Longest canal tunnel in the world, abandoned in the 1960s.

Abandoned blockhouses from Nazi Germany's Atlantic Wall erode into the sea on a French beach.

Old vessels have been transformed into artistic canvases in this unusual cemetery.

The remains of this castle, known as the Witch’s Eye, watch over the Thur Valley.