Abandoned waterpark turned counter-culture mecca.

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

This ancient Spanish castle sits high upon a hilltop.

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

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

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

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

Village situated on a narrow volcanic escarpment.

Stunning Roman aqueduct used for 1900 years and still standing.

A Romanesque tower appears when water levels drop.

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

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

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

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

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

An isolated village literally built into the crevices and rock formations of a mountain.

A Spanish forest is filled with mysterious stone carvings.

A gravity-defying "devil's bridge" that has a surprising architectural feature for its stability.

Barcelona's historic 19th-century sewers, whose foundations were laid in medieval times, are open to the public for exploring.

Wonderland replication in progress by one persistent man.

An enchanting monastery in the Spanish countryside appears lifted from a fantasy tale.

Mountain where Jesus was first tempted by the Devil.

These secluded and abandoned anti-aircraft defenses have become one the most scenic viewpoints in Barcelona.

This cemetery features modernist statues as strange as its name.