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

It is still illegal to "quarrel" at this unlikely urban oasis built on top of an electrical substation.

The breadfruit-adorned final resting place of the infamous Captain of the HMS Bounty.

The handiwork of a underdog clockmaker who solved an impossible problem for an Empire, and forever revolutionized seafaring.

A mineral spring that became all the rage in 17th-century England.

A discarded movie prop that was the original monolith for "2001: A Space Odyssey."

This coffee shop lies hidden beneath a historic church.

A 1950s beatnik coffee house, turned 60s counterculture hotspot, turned modern music venue.

A building that survived WWII, possibly on the virtue of its name alone.

The largest clown school in Britain offering accredited degrees.

The bronze uniforms commemorate the vital role of women during World War II.

One of the few remaining examples of 19th-century London’s attempt to clean up its reputation.

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

The cedar tree in Highgate Cemetery earned its title by accident.

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

This historic building displays the remains of a victim of the devastating 14th-century plague.

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

An ornate and disused early 20th-century building has been given new life as a fully operational structure, complete with offices, oyster bar, and a furniture retailer.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

A monument to the thrice mayor of London who according to lore made his fortune by selling his rat-chasing cat.

The ruins of a church destroyed by both the Great Fire of London and the Blitz, now turned into a peaceful garden.

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

A series of carved figures that scandalized British society.

Locals call it the "Give Peas a Chance" bridge because of its distinct graffiti.