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

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

Rebuilt remains of a temple to Roman god Mithras.

This luxury shopping lane has been protected by its own tiny police force for over a century.

At the top of the hour, figures of the London department store's two co-founders emerge and bow to each other.

This London marker celebrates the spot where the world-famous English band was founded.

This London plaque marks the spot where David Bowie's famous alien made his debut.

Several plaster noses are hidden in plain sight around London's Soho neighborhood.

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

Since 1887, this old-school shop has stacked its shelves with extraordinary coffees and teas.

Buried for centuries, this hidden cellar is all that remains of London's medieval Whitefriars Monastery.

An unusual round church in London with a Templar past.

Remnants of cells from the most notorious London prison may lie in the basement of a rare Victorian Gin Palace.

Public access to clean drinking water was an instant hit among the masses.

The taxidermied remains of a once-great parrot.

A portly statue of a golden boy commemorates an unusual cause of the Great Fire of London: the sin of gluttony.

A collection of comics, graphic novels, animation and caricatures devoted to exploring this often overlooked art form.

A plaque hangs near the execution place of the Scottish Independence leader famously depicted in "Braveheart."

Drink your espresso at a Victorian-era urinal in this underground-restroom-turned-coffee-bar.

The quaint little store that is said to have inspired a famous Dickens novel was only given its name after the book was released.

The curios of pharmacist and collector Henry Wellcome.

A labyrinth hides in plain sight at each of the city's 270 Tube stations.

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

This 1920s Dutch barge is now a floating bookstore.