Catacombs turned marketplace.

A special shop catering to the needs of things that go bump in the night, and also helps kids become writers.

Rebuilt remains of a temple to Roman god Mithras.

The curios of pharmacist and collector Henry Wellcome.

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

A vast overgrown cemetery, once known as one of London's "Magnificent Seven."

Eighty million natural history specimens call this gargantuan museum home.

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

One part local history, 99 parts gruesome haunted house.

A student driver's nightmare.

A tongue-in-cheek arcade where the games are based on everyday life.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

Winding paths and ramshackle mausoleums in the oldest "park cemetery" in London.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

This collection of illusory paraphernalia has been culled from the history of London's premier magician's club.

This South London cemetery holds the remains of more than 15,000 people.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.

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

This landmark church concealed a crypt packed with bones that was discovered thanks to the London Blitz.

The taxidermied remains of a once-great parrot.

Dictionary Johnson’s favorite feline.

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

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