A public park off the beaten path with a beautiful waterfall and 13th century Cistercian abbey.

The bizarre home and sculpture garden of an eccentric artist.

A castle-like sea fort from the 17th century is now a museum to oyster farming.

This collection of French root art looks like an indoor fairy wonderland.

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

This bridge was constructed from the rubble of the infamous Bastille.

100-windowed castle turned art gallery, built by one dedicated mason.

This French "sea of rocks" is packed with stunning rock formations and its own medieval castle.

Artist's eccentric property excessively decorated with found objects and work of his own.

A towering baroque basilica jutting out of the French countryside.

The ruins of a Duke's bucolic dream, where camels once roamed alongside "Dutch" windmills and faux-Italian vineyards.

The first green space constructed on an elevated viaduct.

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

Walk through living pictures and music in the Cathedral of Images.

This submersible road connecting a French island to the mainland is lined with safety towers for when the tide strands travelers.

A self-built mosaic house and sculpture park.

Museum in a swimming pool where the water still flows.

This historic island prison holds one of the dungeons from the Count of Monte Cristo even though it is a work of fiction.

Got apples?

A natural arch carved by a river gave its name to the so-called "Cave of Forgotten Dreams."

Statue of a decomposing prince that once held his heart in its hand.

An aluminum skeleton brings Chinese mythology to the French shore.

Monsters and miniatures are held in equal esteem at this wondrous museum.

A lone cannonball remains lodged in the walls of the Hotel de Sens as a sober reminder of a revolution.