An abandoned airport in the middle of nowhere.

These magnificent city walls rise from the barren sun-baked Spanish plains like something straight out of a fairytale.

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

Catalonia Tradition: Beating the hollow Christmas log until it defecates in your fireplace.

Vibrant street art created with mixed media.

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

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

A museum filled with tiny, adorable versions of the mighty Royal Danish Navy.

This historic Art Nouveau townhouse was the former home of the son of a famous chemical inventor and industrialist.

This whimsical statue dumps water on its head to symbolize knowledge flowing into his brain. Or maybe booze.

Three floors of musical instruments coming from all corners of the world and hundreds of years of musical history.

Cozy basement bar sports an inventory of over 2,000 beers.

This striking structure is the Socialist-modernist centerpiece of a former Soviet spa resort.

What this Good Friday parade lacks in baroque filigree it makes up in somber gothic imagery.

Traversing steep Alpine slopes, this engineering marvel is one of the longest and highest funiculars in the world.

These abandoned salt flats are now a haven for wildlife.

The ruins of an ancient fortification wall sit in front of and underneath this boutique hotel.

The partially submerged ruins of a white marble quarry used in ancient Greece for over 1,200 years.

A crushed gate and giant bronze head serve as a reminder of Greece's fight for freedom.

This once-derelict building is now one of the most beautiful bookstores in the world.

Eastern Bloc nostalgia, anybody?

The walls of this tiny Italian church are entirely covered with frescoes.

In medieval times this small stone seat was used as a bizarre way to punish insolvent debtors.

Psychoanalyst Carl Jung reported a paranormal experience after visiting this mosaic-lined Roman baptistry.