This chest hospital with a dark, haunted past serves as a fitting set for horror films and a paradise for ghost hunters.

Lava stone structures possibly dating back to the 19th century may have been a stopping point for voyagers between ancient Egypt and the Mayan Civilization.

The largest medieval water tank on the Iberian Peninsula is preserved beneath the Cáceres Museum.

This huge abandoned fortress hidden inside a mountain holds a world of subterranean secrets.

These primitive rock paintings include a very beloved depiction of a woolly mammoth.

Down this yellow brick road, visitors are treated to toadstool houses and massive mushroom sculptures.

This influential Renaissance-era library was once the haunt of kings and monks.

A hidden medieval crypt where a famous legend says the devil used to teach black magic.

A magnificent, long-abandoned castle built in the wake of the reconquest of Spain.

A cheese discovery made by shepherds became the pride of a region.

The walls of these four caverns are filled with art that dates back to the earliest human presence in Europe.

A well-restored ancient archaeology site gives a real feel for life during the Roman age.

A complimentary beverage is offered to the bodega's resident rodents every day.

The Roman city was the birthplace of various emperors and is home to one of the empire's most impressive architectural feats.

The largest prehistoric cemetery on the Balearic Islands dates back over 2,500 years.

The ruins of a 2,000-year-old Roman fishing village perched on one of the best beaches in Spain.

This abandoned, turn-of-the-century astronomy hub is now the subject of more photographs than it ever took.

This local emblem is the oldest and largest dragon tree in the Canary Islands.

Remarkably intact Roman stone fortifications have encircled this Spanish city for centuries.

Spain's stunning solar energy plant.

A breathtaking and biodiverse wilderness in the mountain setting of Ernest Hemingway's "For Whom the Bell Tolls."

An archeological treasure trove stumbled upon by a couple of children.

You can soak in three relaxing pools filled daily by the tide.

A micro-communist utopia in Spain with no police, no mortgages and full employment.