A charming beach town in Turkey captures all the colors of the rainbow.

The streets of a sleepy Spanish town proudly exhibit some of the world's finest graffiti.

Ottoman-era houses lovingly preserved.

A subterranean relic of the Spanish Civil War hides below this picturesque park.

An impressive display of ships and artifacts from the ancient Mediterranean maritime trade.

The ornate miniature mansions were built for Istanbul's feathered residents.

An abused and forgotten metropolis, abandoned for centuries.

A Turkish ghost town abandoned in a population exchange with Greece.

Roman ruins top white travertine terraces formed by ancient hot springs.

The hidden ruins of an old hydroelectric plant reclaimed by nature.

A micro-communist utopia in Spain with no police, no mortgages and full employment.

This amazing example of Valencian Art Nouveau looks more like a cathedral than a public market.

This plaque tells the story of an event that took place in an imagined parallel universe.

A display of torture devices used in the Spanish Inquisition and other scourges of medieval Europe.

The former 1920s mansion of a prominent Catalan developer was used as the Soviet Embassy during the Spanish Civil War, and there is still a bunker below the garden.

This rusting remnant of the local herring industry is being given a second life.

This collection of unique liquids allows visitors to wander the waters of Iceland's glaciers.

Travel deep inside of Europe's second largest glacier in the world's largest man-made ice cave.

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

Record-holding coffin moonlights as an eatery run by undertakers.

Of course Salvador Dalí lived in a castle...

One of the largest ossuaries in Spain is packed from floor to ceiling with bones.

This museum explores the tumultuous history of Lviv under Nazi and Soviet occupation.

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