This gravelly, dangerous highway is the only road in the United States that leads to the Arctic Ocean.

A quaint medieval millhouse hovers surprisingly above the waters of the Seine.

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

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

This Parisian gem is one of the most incredible ethnographic museums in the world.

This futuristic observatory at the top of the Pyrénées offers unrivaled views.

A bike train runs along a disused railway line through the tranquil French countryside.

One of the largest ochre quarries in the world, hidden in a limestone landscape.

This medieval tower is all that remains of the castle where Joan of Arc was held before being burned at the stake.

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

The narrowest street in Paris.

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

A medieval military street hidden beneath a charming French fishing village.

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

Avant garde house of Pierre Cardin on the Cote d’Azur.

These quaint French houses dangle precariously over a precipice.

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

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

This stunning natural double arch, the largest in the Alps, went undiscovered until 2005.

A Gothic cathedral created from volcanic rocks.

Science fiction's grandfather has a fittingly marvelous tomb.

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

This life-size replica of the Statue of Liberty's flame is also a tribute to Princess Diana by default.

Natural history museum celebrating biodiversity with a parade of taxidermy animals.