An eerie, existential museum dedicated to the author of "The Metamorphosis."

A miniature train-ride through Slovenia's largest cave system.

This one-time health resort was used by aristocrats around the world.

This sprawling concrete suburb of Kraków was designed by the Soviet Union as the model proletarian city.

A statue honors the children who fought Nazis in Poland.

Monumental sculptures guard many of the graves, transforming this necropolis into an open-air fine art museum.

Austria's ultra-modern art museum looks like Cthulhu's giant alien heart.

Resting in the middle of an Austrian river, this sci-fi "island" lets people cross in neon style.

This skeleton-filled altar piece served as a backdrop to one of the most iconic scenes in "The Sound of Music."

Archduke Ferdinand II's collection of rare objects is considered one of the oldest museums in the world.

This micro-nation may be some sort of prank, but its constitution sure seems official.

This Slovakian statue of an emerging sewer worker might just be a bronze peeping tom.

The housing complex served as an anti-fascist fortress during the Austrian Civil War.

Swiss vineyards in a UNESCO heritage site.

This historic covered bridge contains a series of macabre paintings that communicate one thing: everyone dies.

This is not only one of the oldest collections in Europe, but also possibly the most beautiful.

340-foot statue built to honour the Heroes of the Soviet Union.

One of the largest museums in Ukraine remembers the story of the German-Soviet War in iconic, brutalist style.

The steepest classic funicular in the world glides along a dizzying incline.

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

A Dutch passageway's artistic, aquatic-themed makeover pays tribute to the capital city's famed waterways.

A beautifully eclectic mix of architectural styles.

The world's first zoo for microbes collecting the horrible and wonderful things living on and around us.

Established in 1638 to battle the Black Death, this botanical garden is a treasure trove of rare flora.