Graffiti from the 16th and 17th centuries cover the walls of this part of the Tower of London.

The first geometric self-supporting spiral stairs in Britain are a truly beautiful sight.

An architectural oddity hides in plain sight on this iconic London bridge.

The sculpture of the deceased cockatoo flops atop its personal plinth.

Tucked away in the Tower of London is the weapon once used to execute high-profile prisoners.

Where condemned pirates met their grisly end at the gallows on the River Thames.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

This artist's home turned gallery/museum preserves the creator's love of "Eastern" influences.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

Mary Kelly was last seen here before she was murdered by Jack the Ripper.

Thanks to modern navigational tools we now know that the true prime meridian runs through a park next door.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

Tucked in a nondescript downtown Brooklyn mall is a bar containing a remarkable turn of the century anatomical wax collection last seen in 1920s Berlin.

A semi-scholarly approach to sex.

Dodge prohibitionists and slide through the telephone booth in Crif Dogs.

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

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

Once one of the world's great cities, Cahokia was a place of religious worship, trade and mass human sacrifice before being mysteriously abandoned.

One street divides a single town that stands in two U.S. states.

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

The only rotating bar in New Orleans has been slowly spinning since 1949.

The second oldest continuously operating bar in Louisiana.

This symbolic piece of New Orleans architecture is also home to a few ghastly stories.

A museum and shop on Bourbon Street located in the former home of the second Voodoo Queen of New Orleans.