Once America's tallest structure, now a Baltimore landmark.

This bug-eyed water wheel uses the power of the Sun to clean up Baltimore Harbor.

Oldest existing church in New York and the inspiration for Washington Irving's "The Legend of Sleepy Hollow."

The real-life site of Ichabod Crane's infamous gourd attack.

This replica of the Greek structure is in the heart of Nashville.

Spitalfields' regal market goat is said to be a monument to the area's migrant population but most are pretty sure it's just a goat.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

Scattered throughout London are ancient remnants of the city's former bounding wall.

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

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

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

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

This unassuming alcove in London’s famous Tower Bridge once served to capture, store, and display dead bodies from the River Thames.

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.

The ritual has been performed uninterrupted for nearly 700 years.

Rebuilt remains of a temple to Roman god Mithras.

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

After nearly 60 years, there's still a bear at Paddington Station looking for help.

This one has sailed five times as far as Sir Francis Drake's famous ship.

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

Murals of the wild parties once held on the frozen River Thames.

The last remaining example of the boatmen's perches that once dotted the south bank of the Thames.

The bridge is a secret gallery of discarded gum that has been transformed into miniature masterpieces.

The "lost friend” is the most famous of the six moai statues that were removed from Easter Island.