Remote ruins of a 2,400-year-old Iberian settlement.

This medieval fortification has weathered the centuries better than any other structure from its era.

The ruins of an ancient stadium that hosted gripping chariot and horse races.

Two towns are linked by an engineering marvel masquerading as a boring suspension bridge.

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

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 whimsical brother of the nearby Fallen Angel statue takes the falling part quite literally.

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

The largest Art Nouveau complex in the world is a Barcelona hospital with a 600-year-long history.

Possibly the oldest church in Barcelona, this basilica has its pagan and Christian mythologies all mixed up.

One of the world's oldest universities houses an incredible collection of anatomical models, mummified body parts, and human bones.

The 2,000-year-old Roman columns are hidden within Barcelona's Gothic Quarter.

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

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

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

This whimsical winery by Antoni Gaudí looks ripped from the pages of a fairytale.

Mine shafts and hard pastries await visitors at this massive mountain of salt.

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

"Alleys of Stone" form natural mazes in Spanish natural park.

Of course Salvador Dalí lived in a castle...

A breathtaking canyon offers stunning views and frightful pathways through an ecological paradise.

Numerous sculptures set along hiking trails symbolize and idealize the relationship between man and nature.

This former Baroque palace on the historic Calle Montcada is a rare architectural gem and was once the meeting place of an aristocratic scholarly society.

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