The largest of London's subterranean rivers and once a mad, bad center of London life.

A totem pole of heads to represent the different stages of life.

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

Only a few pieces remain of the structure that carried people and goods across the Thames for some 600 years.

The last four extravagant street signs of London's historic banking street.

These Victorian era devil sculptures were designed to spite a local vicar.

The remains of an ancient Roman teenager are memorialized at the base of a modern London landmark.

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

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.

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

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

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

Outside of one of Britain's most renowned social clubs, a step installed specifically for the Duke.

William Smith's iconic "map that changed the world" is hidden behind a curtain in the Geological Society building.

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

The Metropolitan Police refurbished the blue box (perhaps not coincidentally) the same year "Doctor Who" returned to TV screens.

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

A statue marks the exact spot where The Boy Who Never Grows Up made his first literary appearance.

London's old-school healing garden.

One of the best-preserved examples of an old town lock-up in the country.

This historic streetcar system has been running since the 19th-century.

A small but charming botanical garden that contains many exotic plant species.

This modest site memorializes a World War II mission described without hyperbole as “the greatest raid of all.”