A whimsical garden of outsider art in the Spanish countryside.

Of course Salvador Dalí lived in a castle...

Sanctuary on a ridge near an ancient shrine to a "Black Madonna" built by the founder of Opus Dei.

A darkly erotic open-air statuary in Catalonia.

Religious dwelling in a Spanish volcano.

In one of the smallest countries in the world stands an original Salvador Dalí sculpture.

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

A Spanish forest is filled with mysterious stone carvings.

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

A former steam-powered mill from the 1800s is now an industrial park with a giant steel dragon slide.

This semi-secret storybook hedge maze is also the oldest garden in the city.

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

One of Europe's largest supercomputers is housed inside of a disused chapel.

This chest hospital with a dark, haunted past serves as a fitting set for horror films and a paradise for ghost hunters.

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

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

Abandoned waterpark turned counter-culture mecca.

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