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

The ritual has been performed uninterrupted for nearly 700 years.

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

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

"We gonna rock down to Electric Avenue, and then we'll take it higher..."

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

A community of artists and entrepreneurs seeks a simpler life on London's waterways.

Two plaques commemorate the site of Shakespeare's first theatre.

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

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

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

A Victorian natural history and ethnographic museum with wonderful turn-of-the-century, science-book-esque evolution displays.

London's smallest police station is barely the size of a phone booth.

The final resting place to 300 Victorian-era pets hides inside the city park.

A makeshift shrine to the late rock star is still kept up on the nondescript façade outside 1 Logan Place.

This 1920s Dutch barge is now a floating bookstore.

Eighty million natural history specimens call this gargantuan museum home.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

The world's largest reflecting pool is just two centimeters deep.

A poignant mural honors the heroic teenage non-conformists who took on the Nazis and paid the ultimate price.

The largest mosque in Germany.

The body of at least one victim of a construction accident was left behind in the collapsed pylon, buried under tons of concrete.

The largest bell in the world has been swinging high above a Cologne cathedral for almost a century.

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.