Considered the birthplace of the Copper Age and Bronze Age, the river is tinted red from 5,000 years of mining.

This awesome Spanish castle is so fantastical it was actually used on Game of Thrones.

Cliffside houses provide a spectacular view from their perch above the valley.

The final resting place of the great navigator, or maybe his brother.

A Spanish town built into the cliffs.

A gravity-defying "devil's bridge" that has a surprising architectural feature for its stability.

A Spanish forest is filled with mysterious stone carvings.

These magnificent city walls rise from the barren sun-baked Spanish plains like something straight out of a fairytale.

A lush indoor jungle fills this bustling Madrid transportation hub.

Natural stone arches form a walkable "cathedral" at low tide, then disappear entirely when the water returns.

An enchanting monastery in the Spanish countryside appears lifted from a fantasy tale.

Week-long block party becomes a competition for the best decorated street.

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

Former bridge turned into an observation tower.

At this monastery, monks make raw-milk cheese and use excess whey to create methane that powers their hot-water system.

The smallest port in France is named after the pirate who created it.

This garden houses the remains of the ancient Greek port of Marseille.

The shape of this old salt factory complex was inspired by the course of the Sun.

This hidden workshop is filled with molds of France's most iconic sculptures.

The vibrant buildings in the “capital of the comic strip” celebrate the art form that made it famous.

The experimental test tracks of a retro-futuristic monorail still stand in the French countryside.

On this romantic tidal island reachable only at low tide the tomb of a famous French writer overlooks the sea.

One of the most powerful religious centers in the Middle Ages, dubbed the founder of Western monasticism.