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

This tangled English forest looks like something right out of a fairytale.

A cluttered and astounding collection of antiquities and curiosities.

London's smallest police station is barely the size of a phone booth.

Banksy gives themself artistic license with this piece of London street art.

A fantastic castle rumored to be the birthplace of King Arthur.

The curios of pharmacist and collector Henry Wellcome.

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

Wedged between two buildings at the Great Ormond Street Hospital is this secret music installation.

The gloomy ruins that inspired Bram Stoker to bring Dracula to life.

The longest hedge maze in the world.

This iconic 1,000-year-old medieval castle is a favorite of the film industry, most notably as the location for Hogwarts in Harry Potter.

Famously misunderstood wonder of the ancient world

The world's largest collection of witchcraft regalia.

Since 1874, this macabre collection has developed into a museum devoted to Scotland Yard's mementos of dastardly deeds.

The sign at the garden gate reads: "These Plants Can Kill."

The mysterious, fantastical woodland inspiration for "The Lord of the Rings."

Putting the "mod" in "modular" since 2000.

The only university zoological museum in London houses extinct animals, bizarre natural history specimens, and a Micrarium of microscopic creatures.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

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

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