Its collection includes a broad array of social, geographic, graphic design, and political history.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

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

Hidden beneath the streets of London is a secret subway that only carried mail.

This coffee shop lies hidden beneath a historic church.

The Great Fire of London and the regulation of one-way streets both started in this alley.

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

The commemorative stone column conceals a secret laboratory.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

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

A Roman spa buried deep beneath the City of London.

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

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

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

The ritual has been performed uninterrupted for nearly 700 years.

There's an exclusive Beefeaters pub hidden in the Tower of London.

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.

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.

Chelsea's soldiers were given strict orders when crossing this historic bridge.

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

Legend has it this gnarled old tree was planted by Tsar Peter the Great during his visit to London.