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

Spain's unique Mosque-Cathedral has been a place of worship for both Muslims and Christians throughout its history.

This imposing modern citadel started out as a home renovation project.

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

The lengthy skeleton of one of the tallest Spaniards of all time is on display in Madrid.

The former 1920s mansion of a prominent Catalan developer was used as the Soviet Embassy during the Spanish Civil War, and there is still a bunker below the garden.

An exact replica of a colossal Olmec head sits atop a pyramid within a Madrid traffic circle.

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

Spain's stunning solar energy plant.

An abandoned Indian-inspired mansion.

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

A Spanish artist builds his own castle.

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

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

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

This religious complex carved into a cliff is steeped in legends of miraculous stags and the Holy Grail.

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

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

The oldest Roman lighthouse still in use.

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

Of the many chalices in the running for the Holy Grail, this one in Valencia Cathedral sure looks the part.

A medieval village holds a very modern hotel.

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

This quaint Spanish village agreed to be painted blue as a marketing stunt but found that they preferred it that way.