One of Antoni Gaudí's least-visited works, an homage to Catalan patrimony that mixes neo-Gothic with Modernista forms.

The abandoned ruins of a beautiful medieval castle just outside Barcelona.

An architect transformed this abandoned cement factory into his castle-like workshop.

This house's itty bitty size means no humans allowed.

A magnificent, long-abandoned castle built in the wake of the reconquest of Spain.

Locals use these rock pools and waterfalls for swimming and cliff diving.

Peek into a cave of giant, glimmering crystals.

An abandoned socialist utopia built in the late 19th century.

Possibly the oldest masonry dam in all of Europe.

Haunted tuberculosis hospital built by the patients.

Fascinating exhibits of prehistoric and ancient artifacts displayed with a uniquely modern touch.

A celebration of solstice followed by a fiery purging of evils.

Bacteria and algae give the salty water its bubblegum hue.

Two 2,500-year-old Phoenician boats found on the coast of Spain, giving incredible insight into the ancient maritime traders.

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