Legend has it the commander of the defenders drew a fateful line in the dirt with his sword just before the final battle.

These docile dragons are ideal inhabitants for the conservatory greenhouses.

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

A student driver's nightmare.

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

A little slice of Japan and its aesthetics in London's Holland Park.

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

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

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

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

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

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

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

A memorial for public executions that dates back to the 14th century.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the first ‘Harry Potter’ film.

Pop culture has helped to keep this iconic British building from being destroyed.

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

The commemorative stone column conceals a secret laboratory.

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

One of London's lost rivers runs through a pipe over the tracks of this subway station.

This intriguing Bronze Age artifact spent centuries hidden within a Welsh faerie hill.

A naturally mummified 2,000-year-old man.

At almost 1,000 years old, this is the oldest known door in all of Britain.

A statue of the legendary Celtic warrior queen who fought the Roman invaders stands in one of the cities she once destroyed.