Blue-green pools and smooth stones comprise one of Spain’s most idyllic hidden wonders.

Numerous sculptures set along hiking trails symbolize and idealize the relationship between man and nature.

Rare karst landscape eroded from a flat seabed.

Earth's rocky history has rarely glittered so brightly as it does in this Spanish museum.

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

The abandoned ruins of a beautiful medieval castle just outside Barcelona.

A charming Spanish village sits atop this natural limestone overpass.

Stunning Roman aqueduct used for 1900 years and still standing.

An isolated village literally built into the crevices and rock formations of a mountain.

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.

A landscape decorated with enormous skull sculptures.

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

The largest Art Nouveau complex in the world is a Barcelona hospital with a 600-year-long history.

Bacteria and algae give the salty water its bubblegum hue.

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

Step inside the first house designed by Catalan architect Antoni Gaudí, considered to be one of the first Art Nouveau buildings.

This cemetery features modernist statues as strange as its name.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

This semi-secret storybook hedge maze is also the oldest garden in the city.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.