An incarceration museum on the spot of possibly the oldest prison in England.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

Semi-precious Blue John stones have been mined in this cavern system for centuries.

The whimsical twist of this spire was either caused by the Devil, an unexpected virgin, or lead.

The former home of a railway legend and the site of a gigantic labyrinth.

One of the last remnants of the Bessemer process that revolutionized steel production during the industrial age.

An underground city of salt.

Lovingly nick-named the "Brick Dick" this municipal tower was winner of the World's Most Phallic Building Contest.

Trade in that pesky human soul for cold-hard circuits.

An ever-evolving wall of graffiti art off East Liberty Street.

The city is full of whimsical portals to another world.

Controversial tribute to the heavyweight champion boxer who grew up in Detroit.

A little-known subterranean street runs under some of the best-known buildings in Chicago's River North.

Cemetery featuring rare glass-fronted columbarium.

A Bibliophile's Dream.

A giant bronze coil of feces is both a tribute to doggie defecation and a reminder to pick it up.

A display of magnificent stained glass windows is the first exhibit of its kind.

This morbid, delightful curiosity shop offers everything from animal bones to human teeth.

Chicago's largest cemetery is full of beautiful Victorian monuments and more than a few ghost stories.

A lush green oasis in the middle of Chicago.

The best Tiki bar in Las Vegas.

Back in 1952, you could get a mushroom cloud chaser with your atomic cocktail.

Stepping away from the glitz of mobsters and casinos to learn about the other history of Vegas.

This incredible collection of vintage pinball machines can be played at 25 cents a pop.