Dilapidated ruins that once treated a notorious young serial killer, currently hosting vandals, squatters, and ghost hunters.

This historic Melbourne bullet factory is fully encased in a massive glass and steel cone.

The labyrinthine storm tunnels beneath the city of Melbourne are ruled by a band of urban explorers.

The word 'wunderkammer' translates as 'wonder-chamber'. This Wunderkammer is both a museum and a retail store.

Occult books, tarot, oddities.

No one seems to know who suffered the disappointment at this particular place.

A preserved factory in the "Home of the Carrousel" is now a museum dedicated to the classic wooden ride.

The famous bell was secreted away and hidden in a church in Allentown during the British occupation of Philadelphia.

An Orwellian sculpture with eyeball cameras watches passersby.

A century-old hotspot for jazz, frequented by everyone from Charlie Chaplin to Al Capone.

Berlin's beloved bear is immortalized at the Museum für Naturkunde.

A collection of art from Bulgaria's time as a communist state.

A historic London pub with prison cells in the cellar and a "spy room" on the second floor.

Scattered around Atlanta are little doors with big charm.

An underground magnet for ever-changing street art.

The "world's smallest volcano" has been used to store meals and dispose of dead bodies.

The great Danube river starts here.

The world's largest squirrel statue clutches a pecan bigger than your head.

Tucked in the back of this amazing antique store is an important piece of medical history.

An ancient capital city that dates back 3,000 years old and harbors many surprises.

World's first "penitentiary," meant to be humane, drove men insane.

Non-profit time travel mart sells goods you would need for a trip through the fourth dimension.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.