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

These quaint French houses dangle precariously over a precipice.

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

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

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.

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

This structure atop a craggy cliff in one of the most beautiful parks in Paris boasts an unbeatable view.

This frog-themed restaurant was frequented by Picasso, Saint-Exupéry, and more.

A 16th-century fountain marks the site of a lost medieval cemetery once filled with mass graves.

The narrowest street in Paris.

This off-limits room in the National Library of France is home to a system of pneumatic tubes, once used to bring books to readers.

Noirish green neon marks the location of one of the oldest private detective agencies in France.

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 salt marsh in Southern France is as pink as the flamingos that inhabit it.

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

An icy lake tucked among jaw-dropping alpine panoramas.

The subterranean "lake" below the Paris opera house inspired the Phantom of the Opera's lair.

Exquisite wall sculptures carved in secret by an early quarryman in an obscure corner of the Paris Catacombs.

Statue of death tucked in the University of Medicine courtyard.

Down a cobblestone alleyway is a museum dedicated to Romanticism, with a secret garden.

Egyptian Revival movie palace abandoned for decades and restored in 2013.

19th century pendulum and a clock restored by a rogue group of guerilla artists.

A surrealist timepiece by the artist of melting clocks.