Amsterdam's Red Light District leaves little to the imagination.

Northern Ireland's Brobdingnagian stepping stones.

World's largest working waterwheel has been around for over 150 years.

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

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

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

Increasingly decayed figures stand as a powerful reminder of the human costs of Czech Communism.

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

Macabre astrological automaton clock dating to the late 1400s.

This spooky statue sits outside a famous Prague theater.

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

Late at night, the bust of the "Dracula" actor was snuck onto the facade of this Budapest castle.

Sitting beneath an unremarkable residential building is a museum devoted to classic Pinball.

Museum dedicated to the terror regimes of Hungary.

Uh, pardon me, ma'am, but I couldn't help noticing that there's a Columbo statue in the middle of Budapest.

A much-loved sculpture depicting the hero of a 1956 anti-Soviet uprising.

A triumphant marble and bronze fountain depicting a 15th-century Hungarian king and his hunting party.

This World War II bunker now survives as a documentation of the Nazi regime and war crimes.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

A Wes Anderson-esque lighthouse that boasts magnificent coastal views.

Walk in the footsteps of the gods and straddle two tectonic plates.

Medicinal spa created with the discharge from a geothermal energy plant.

If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.