An eccentric collection of antique items shares space with a prop-quality witchcraft museum.

The oldest Roman lighthouse still in use.

This ancient Spanish castle sits high upon a hilltop.

A site where “the ravages of the war are more striking…than any other place in contemporary Spain.”

A Romanesque tower appears when water levels drop.

This massive fiberglass Gulliver turns every visitor into a Lilliputian.

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

One of the largest ossuaries in Spain is packed from floor to ceiling with bones.

The morbid items in this small and hidden museum are not for the weak stomached.

Mysterious Spanish catacombs of unknown origins.

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

Village situated on a narrow volcanic escarpment.

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 Spanish forest is filled with mysterious stone carvings.

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

Spanning the El Chorro gorge, this pathway used to be one of the most dangerous crossings in the world.

Barcelona's historic 19th-century sewers, whose foundations were laid in medieval times, are open to the public for exploring.

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

A museum dedicated to the Spanish occult in a town that was terrorized by the Inquisition.

Mountain where Jesus was first tempted by the Devil.

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

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

This abandoned mansion has a window for every day of the year, and is a temple for ghost hunters.