Living towers made of people that are now recognized by UNESCO.

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

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

This underground church is topped with a 500-foot cross that is seen by many as a beacon of fascist hubris.

Over two centuries old and counting, Madrid's massive botanical garden contains one of Europe's only desert environments.

A temple to modernity, tucked away amid Barcelona's more well known museums.

In the fictional world of Kcymaerxthaere, celestial wonders marked a portal to a powerful route of travel at this site in Madrid, Spain.

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

Stunning Roman aqueduct used for 1900 years and still standing.

Abandoned for decades, trains still pass through the now-restored remains of one of Madrid's first metro stations.

Of course Salvador Dalí lived in a castle...

Giant eggs, walls of bread, and nightmare surreality mark the largest collection of works by Salvador Dalí.

One of the few remaining ancient aqueducts described by Frontinus as 'the most solemn testimony of the Empire.'

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

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

The final resting place of the great navigator, or maybe his brother.

The oldest restaurant in the world is this old-world Spanish eatery, still known for its suckling pig.

Mountain where Jesus was first tempted by the Devil.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

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

This cemetery features modernist statues as strange as its name.

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

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

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.