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

A contemporary art installation housed within a Gothic cathedral.

Stuck in the middle of a modern Madrid city block are the remains of a 19th century sports complex.

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

A 16th-century Andalusian palace.

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

An impressive display of ships and artifacts from the ancient Mediterranean maritime trade.

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

12th-century holy complex shares land with a natural park full of heavenly waterfalls and raptors.

A network of hundreds of interconnected wineries in caves hides under the town center.

The Gaudí-inspired building that was the start of Terrassenc modernism.

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

For one day every month Barcelona's Estació de França transforms into a market for model trains.

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

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 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.

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

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

An abandoned Indian-inspired mansion.

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

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

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

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