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

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

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

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

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

These wire animal sculptures commemorate the exotic inhabitants that once called the Tower of London home.

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

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

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

The majority of the museum's large collection is held in a storage space open to the public a few times a year.

A roadside shrine to a late rock god only remains thanks to the unyielding efforts of his fans.

A student driver's nightmare.

The John Snow Memorial marks the epicenter of London's 1854 cholera epidemic.

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

The next-door homes of two very different musicians, George Frideric Handel and Jimi Hendrix.

A unique tribute to the millions of animals who served and died for the British military.

You'd never know the houses at 23-24 Leinster Gardens were fakes—until you see the train tracks on the other side.

Legend says these colorful, invasive residents are the descendants of birds released by Jimi Hendrix.

This once-controversial and slightly confusing statue of Achilles was built out of captured cannons.

This overlooked street light once served as a KGB dead letter box.

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

The medieval woodcut-style artwork chronicles life in medieval London.

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

The commemorative stone column conceals a secret laboratory.