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.

A display of torture devices used in the Spanish Inquisition and other scourges of medieval Europe.

A stone slab in Madrid marks the point from which the distances of Spain's national roads are measured.

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

This "flat geyser" bubbles up out of the ground periodically like a disappearing river.

The Cathedral of Salamanca has a number of unusual carvings but none so surprising as a modern astronaut.

This cafe offers a curated collection of treats and tipples made by monks and nuns.

Spain's stunning solar energy plant.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

An abandoned Indian-inspired mansion.

This former charity hospital for elderly clergy houses some of Seville’s most treasured paintings.

This funky former tobacco factory is one of the most striking examples of Madrid's cultural diversity.

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

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

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

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

A Spanish artist builds his own castle.

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

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

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

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

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

A huge cathedral single-handedly constructed by one eccentric monk.

A darkly erotic open-air statuary in Catalonia.