Village situated on a narrow volcanic escarpment.

A Romanesque tower appears when water levels drop.

Holy Grotto of Montserrat Monastery holds one of Europe's mysterious black Madonnas.

Gaze upon chocolate sculptures depicting everything from chariot races to Gaudí's famous church at this shrine to sweets.

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

Abandoned Nazi train station turned underground astroparticle laboratory.

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