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

These quaint French houses dangle precariously over a precipice.

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

For hundreds of years, automatons moving to metallic music have been marking the passage of time.

A Gothic cathedral created from volcanic rocks.

The mental institution where Van Gogh created some of his most famous work now allows guests to walk in the artist's footsteps.

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

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.

An icy lake tucked among jaw-dropping alpine panoramas.

Original cabaret handbills, posters, and feline artwork are a purrfect highlight of the Museum of Montmartre.

A 14th century bridge built as a fortress, where the devil lurks on one of its towers.

One of the last umbrella repair shops in Paris upholds the nostalgic art of umbrella making.

Medieval museum built over Roman baths that features famous tapestries of a lady and a unicorn.

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

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

This massive library holds what was once the largest book collection in the world.

Abandoned railway line circling the city of Paris.

The Incas turned this ancient Wari aqueduct into an imposing defensive gate.

A paradisical gorge with rapids, waterfalls, and wildlife whose raw beauty is the stuff of CGI movies.

This small oxbow lake has rare giant river otters and some Seussian-sounding birds.

A pretty park of over 1,600 olive trees that grew from just three saplings brought over from Spain.

The world's fifth tallest waterfall is a spectacular silver chute of water that cuts through the cloud forest in northern Peru.

With nearly double the depth of the Grand Canyon, this Peruvian canyon is one of the deepest in the world.