Walk 2,300 feet above the ground on the "Troll's Tongue."

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

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

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

This ancient Roman bridge and aqueduct still stands as a wonder of classical construction.

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

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

Museum on French naval history, with magnificent figureheads, a historic diving suit, and a boat used by Napoleon.

An aluminum skeleton brings Chinese mythology to the French shore.

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.

Massive puppet-automaton machines created by French artist collective Machines de l’Ile.

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.

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

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

This surreal statue brings a famous French novel about a supernatural cad to arresting life.

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

This French ghost town from World War II has been left as a memorial to German atrocities during World War II.

One of the oldest medical collections in Europe focusing on rare surgical instruments.

A museum of carnival attractions where you are invited to ride the rides.

This subterranean shrine beneath a bike rental store celebrates the iconic Italian scooter.

The ruins of a medieval village that was abandoned after a 19th-century inferno.