This "flat geyser" bubbles up out of the ground periodically like a disappearing river.

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

Stormy conditions send jets of seawater bursting through holes in the cliffs.

Turntable anonymously received orphans, alms, and groceries.

A landscape decorated with enormous skull sculptures.

Wonderland replication in progress by one persistent man.

A darkly erotic open-air statuary in Catalonia.

A century-long search for a church that was never there.

Bell tower juts out from a village buried under a lake.

Stalin's march toward a more modern USSR flooded a monastery, leaving a unique and extravagant nautical marker, "The Flooded Belfry."

A Romanesque tower appears when water levels drop.

Moorish signal station on a stratgic rocky outcrop.

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

Of course Salvador Dalí lived in a castle...

A completely underwater art museum sends a stark message about humans' impact on the environment.

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

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

A beautiful but toxic fountain of mercury.

Hundreds of stone stairs and a winding medieval bridge connect this haunting Spanish island to the mainland.

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

This cemetery features modernist statues as strange as its name.

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

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

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