An Arizona museum with a collection of pharmaceutical oddities, including a jar of a gangster's chewed gum.

Near Birmingham, England three and a half miles of top-secret tunnels housed a World War II “shadow factory” and a Cold War nuclear bunker.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

The birth home of one of cinema's legendary actresses.

This ornate English estates "Prodigy House" still bears the cannonball marks of civil war.

You can spend the night in Dr. Frank-N-Furter's castle.

This restaurant was removed from the famed sister ship of the Titanic and placed within a hotel.

The home where a lovestruck Fitzgerald wrote his first published novel, "This Side of Paradise."

Though many were skeptical at first, these animal-specific routes across the Trans-Canada Highway have been a major conservation success.

The pioneering photographer's prints are immortalized inside her childhood home.

The most photographed house in Maine looks good enough to eat.

This shop and gallery is a modern-day cabinet of curiosities, unassumingly positioned along an urban thoroughfare.

Six tiny houses built for working class people form the largest intentional cluster of Wright homes anywhere.

Not one, but two of Frank Lloyd Wright's architectural masterpieces nestled on the same street.

The oldest Italian café in Boston, this spot also serves as a veritable museum of vintage coffee ephemera.

Shelves covered in dozens of coffee bean varieties fill this North End institution.

This attraction was abandoned after the Chernobyl disaster.

An antique store houses the last operational diner from the defunct department store chain.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

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

Peek into the world of those creating the beautiful, delicate paper parasols found all over the globe.

The Columbia Road Flower Market is now open every Sunday, rain or shine.

In this cobwebbed old operating theater, you can practically hear the screams of the unanesthetized patients.

The largest of London's subterranean rivers and once a mad, bad center of London life.