Walk through Czech history in Prague's largest graveyard.

A church of bones, decorated with 40,000 human skeletons.

The hidden lair of an alchemist rediscovered in a 2002 flood.

Countless grotesque faces stare out from this eerie Prague art wall.

Macabre astrological automaton clock dating to the late 1400s.

A Jenga-style cylindrical tower of books that appears to go on forever.

Two stunning 17th-century libraries and a cabinet of curiosities.

The history of occult science is turned into a creepshow at this lurid Prague tourist attraction.

Aged nearly 1,700 years, the world's oldest bottle of wine is probably still drinkable.

This red light district plaza memorializes the Fab Four and their historic connection to the area.

A massive playground in the woods of Germany.

A pair of giant stone heads represent the ancient Roman saints beheaded here.

A funerary monument for two brothers who served in the Roman cavalry.

This unusual sculpture depicts how coins were made when minting was done by hand.

Visitors may notice something strange walking through this quaint German town.

This gateway to subterranean Hanover plays jazz, pop and rock to surprised passersby.

This unusual small wind turbine in Germany has only a single rotor blade.

This 17th-century "unicorn" was cobbled together from the skull of a rhinoceros, the legs of a mammoth, and the horn of a narwhal.

An ornate sculpture of an ox in repose marks the former entrance to Nuremberg's medieval meat market, which was destroyed during World War II.

How did a lighthouse wind up in the middle of this landlocked German city?

A six-story, asymmetrical tower filled to the brim with scientific experiments.

A beloved street vendor is memorialized outside a German train station.

The bridge that cost Germany a World Heritage Site.

If you visit the burial place of King Frederick the Great, you'll likely find a couple of potatoes sitting on his tombstone.