Charles Babbage's proto-computer, painstakingly brought to life.

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

Following the trail of an old metro line, this scenic path is haunted by a creepy spriggan statue.

Dictionary Johnson’s favorite feline.

Giant, friendly pelicans in Central London, the most unlikely of places.

The remains of Crystal Palace Great Exhibition of 1851.

The signs of a long buried road can still be found hidden beneath a London sewer grate.

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

This legendary stone is of unknown origin, and throughout history has been a literal touchstone for British leaders.

A closed London rail station created to cart away the dead still bears the marks of attempts to make it less morbid.

A subterranean ice warehouse that has lain hidden beneath central London for over a century is now open to the public.

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

Hidden beneath the streets of London is a secret subway that only carried mail.

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

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.

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