Cliffside houses provide a spectacular view from their perch above the valley.

The fragmented remains of a massive public bath connected to the city's water supply.

A curious carving hides on a marble column in the Mosque-Cathedral of Córdoba.

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

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

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

The world's most elegant power lines.

One of the most spectacular bridges in Spain spans a narrow chasm that divides the city of Ronda.

Bold black and white motifs of life and death add a dramatic flair to this 17th-century crypt.

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

This amazing example of Valencian Art Nouveau looks more like a cathedral than a public market.

A daily pyrotechnic celebration marks a beloved tradition during Valencia's festival season.

The blowhole bursts spectacularly right next to the buildings in a medieval seaside town.

Stunning Roman aqueduct used for 1900 years and still standing.

Long tunnels run under the ancient chariot racing circuit to the tower.

This Roman arena once played host to bloody gladiatorial battles.

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

This stunning iron gate designed by Modernist architect Antoni Gaudí is filled with mythic symbolism.

This cemetery features modernist statues as strange as its name.

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

Step inside the first house designed by Catalan architect Antoni Gaudí, considered to be one of the first Art Nouveau buildings.

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

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.

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