Seaside ruins of a settlement that date back to the first century B.C.

The oldest giants in Catalonia are now displayed in a 14th-century Gothic church.

This remarkable prehistoric town is full of watchtowers and houses that have withstood thousands of years.

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

An abandoned Indian-inspired mansion.

An ancient Roman theatre restored to its former glory in the Spanish city of Cartegena.

A Spanish artist builds his own castle.

Visit a surreal landscape so otherworldly NASA actually used it to train the Apollo 17 crew.

Possibly the oldest church in Barcelona, this basilica has its pagan and Christian mythologies all mixed up.

Thanks to an acoustic anomaly, this unassuming stone bench has heard one hundred years of secrets.

Giant granite sculptures representing family on the northern coast of Spain.

Now a pile of ruins and rubble, this was a lovely mountain town as recently as 1960.

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

A darkly erotic open-air statuary in Catalonia.

The oldest Roman lighthouse still in use.

On La Gomera, "Silbadors" communicate in a 4,000-word language of whistles.

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

Holy Grotto of Montserrat Monastery holds one of Europe's mysterious black Madonnas.

A former steam-powered mill from the 1800s is now an industrial park with a giant steel dragon slide.

Abandoned waterpark turned counter-culture mecca.

Famed architect Antoni Gaudi built this generous thank you gift to a friendly host who housed him during a job.

This ancient Spanish castle sits high upon a hilltop.

Rare karst landscape eroded from a flat seabed.

The 2,000-year-old Roman columns are hidden within Barcelona's Gothic Quarter.