Commonly acknowledged as the only public monument to the Devil himself.

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

Hundreds of stone stairs and a winding medieval bridge connect this haunting Spanish island to the mainland.

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

Village situated on a narrow volcanic escarpment.

Cursed swimming pool left abandoned is now a favorite of filmmakers and ghost hunters.

Mysterious Spanish catacombs of unknown origins.

Partially collapsed lava tube and cave system complete with concert hall, underground pond, and unique albino crabs.

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

At the foot of a waterfall lies a peaceful swimming lagoon and evidence of over 60,000 years of human habitation.

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

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

A Spanish town built into the cliffs.

Wonderland replication in progress by one persistent man.

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

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

Poseidon? No one seems to know.

The historic tower houses of this nearly abandoned Greek town have been compared to the spikes on an iguana's back.

This town named for the ancient God of War is home to fewer than a thousand people, but it's the birthplace of the Greek Revolution.

These ruins in Volvi were once at the intersection of the Eastern and Western Worlds.

Seventeen oak trees sprout from the roof and walls of this tiny chapel without any visual evidence of roots.

The ghost town where the villagers refuse to leave.

Hidden in a secluded Greek cove is a pristine beach marred only by the rusting smuggler's hulk stranded on its shores.

A naturally beautiful, seemingly bottomless deep blue spring.