Medicinal spa created with the discharge from a geothermal energy plant.

According to the local folklore, the myriad colors of this lake are the result of a lovelorn wizard's blunder.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

A luxury hotel housed in a former 15th century Gothic church.

A late-medieval Dutch castle with trick fountains in its whimsical water gardens.

A true Valhalla for cactus and succulent lovers.

This cheese shop also houses a museum devoted to Dutch dairy.

Established in 1638 to battle the Black Death, Hortus Botanicus Amsterdam is a treasure trove of rare flora.

If they push on just the right spot, even the weakest person can move this titanic boulder.

The artist and his brother are buried in a landscape straight out of a van Gogh painting.

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

The great Italian Renaissance painter was laid to rest here in the Chapel of Saint-Hubert.

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.

An icy lake tucked among jaw-dropping alpine panoramas.

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.

One of the greatest maze designer’s greatest mazes.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

Each spring, a dreamlike carpet of bluebells overtakes the forest floor.

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