The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

The birthplace of Karl Marx is now a museum dedicated to the communist revolutionary's life and work.

This lurid German fountain plots the sad course of marriage from dating to death.

This 600-year-old home seems to defy physics.

The last bastion of Roman presence north of the Alps looms over a German town.

When a medieval fire claimed the original St. Stephen’s Cathedral, it sparked a pattern of unquenchable organ building.

This Dresden church was purposely rebuilt Protestant after being demolished in World War II.

The oldest Jewish cemetery in Europe survived Hitler's Germany.

It houses the remains of a 17th-century version of the Titanic.

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

Giant topiary dog once played a role in a terrorist bomb plot.

The oldest Roman lighthouse still in use.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

The design of this beautifully crafted building was inspired by Norwegian glaciers.

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

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

The birthplace of the builder of the Statue of Liberty is now a museum dedicated to his work.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

The European towns of Brașov and Râșnov each have proud signs reminiscent of the Hollywood sign.

A black cat protests the City Guild in Riga's Old Town.

Macabre astrological automaton clock dating to the late 1400s.

This automated sculpture of two men peeing will spell out text messages with their micturition.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.