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

The world's tallest bridge is also possibly the most elegant.

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

A French valley with forests so lush it was nicknamed "the Small Amazonia of the Pyrenees."

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

The world's largest reflecting pool is just two centimeters deep.

This is what trains will look like after the zombie apocalypse.

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

Beautiful carved tunnels.

The fantastic architectural models of a French traveler.

These quaint French houses dangle precariously over a precipice.

A well-preserved medieval village nested on a rocky outcrop and surrounded by a network of cliffs, natural bridges and canyons.

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

This massive blockhead sculpture hides an entire library.

This natural French spring has been turned into a magical grotto by Roman and medieval constructions.

At Monet's beloved home you can still see the Japanese bridge, waterlilies, and weeping willows that were the subjects of some of his most iconic paintings.

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

One of the greatest maze designer’s greatest mazes.

The oldest stone house in Paris was built by its most famous alchemist.

The rusted hull of a WWII German destroyer pokes above the surface in a Norwegian fjord.

What might look like a cliffside sacrificial altar at first glance is actually a stone compass pointing to cities and lighthouses all around the world.

A naturally occurring tunnel in this Nordic mountain makes it look like it's been shot.

Knights Templar are visible inside this stunning Cistercian abbey.

A massive bridge forms part of an aqueduct that was deemed an architectural wonder of its time.