A wunderkammer hidden on the top floor of the Hartford statehouse.

The former home of Samuel Clemens and family remembers the happiest period of the author's life.

A comic book store got the road by its shop officially renamed after Superman's girlfriend.

This monument to those fallen in the World Wars is accompanied by a U-boat that Germany bought for a Deutsche Mark.

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

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

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

A tiny chapel clings to a precipice above Germany’s gemstone capital.

World's largest barrel containing an inn.

Once a private collection, now the only museum of arms and armor in the Western Hemisphere - CLOSED.

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

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

Despite attempts by local police to discourage it, Beatles-inspired graffiti has been a means for artists to air grievances for decades.

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

Macabre astrological automaton clock dating to the late 1400s.

This massive blockhead sculpture hides an entire library.

For hundreds of years, automatons moving to metallic music have been marking the passage of time.

Monsters and miniatures are held in equal esteem at this wondrous museum.

Hundreds of hidden passageways weave through the old quarters of Lyon.

The "feral child" who appeared in Bavaria in the 19th century remains as much a mystery as his unsolved murder.

The ruins of this Dutch castle sit atop a labyrinth of once-secret tunnels and passageways, dating back over 900 years.

A beautiful maze marks where three countries meet.

Largest illuminated advertisement sign in the world.

The largest bell in the world has been swinging high above a Cologne cathedral for almost a century.