Hidden beneath the streets of London is a secret subway that only carried mail.

A bus with a butt and biceps to put Olympic athletes to shame.

A sculpture of the iconic East German car on four legs is a tribute to those who traveled to Prague seeking asylum.

A steampunk-styled three-floor factory churning out art, activism, and electronic beats.

An Orwellian sculpture with eyeball cameras watches passersby.

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

Monument to a suicide protesting the Soviet invasion.

This bar and museum are devoted to the controversial comic book work of Kája Saudek.

An old asylum graveyard that's been abandoned for half a century attracts those seeking a dark thrill.

A collection of anatomical samples from one of the first anthropologists to suggest that humans reached North America by crossing the Bering Strait.

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

A 400-year-old mummified arm dangles from the ceiling of St. James the Greater, serving as a warning to thieves.

The first museum in the world devoted to sexual gadgetry.

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

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

Macabre astrological automaton clock dating to the late 1400s.

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