"Alleys of Stone" form natural mazes in Spanish natural park.

Moorish signal station on a stratgic rocky outcrop.

A Romanesque tower appears when water levels drop.

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

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

Stunning Roman aqueduct used for 1900 years and still standing.

A Franco-era dam flooded (almost) everyone out of this centuries-old Aragonese town.

Village situated on a narrow volcanic escarpment.

Mysterious Spanish catacombs of unknown origins.

This Navarrese cave's history of witchcraft and pagan ritual is not just embraced, but recreated each year.

One of the few remaining ancient aqueducts described by Frontinus as 'the most solemn testimony of the Empire.'

A landscape decorated with enormous skull sculptures.

This whimsical winery by Antoni Gaudí looks ripped from the pages of a fairytale.

A Spanish forest is filled with mysterious stone carvings.

This former Baroque palace on the historic Calle Montcada is a rare architectural gem and was once the meeting place of an aristocratic scholarly society.

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

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

Bask in the 19th century grandeur of an eccentric Freemason millionaire's private gardens.

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

An ancient Egyptian temple in the middle of Madrid, Spain.

Wonderland replication in progress by one persistent man.

This cemetery features modernist statues as strange as its name.

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

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