The remains of Crystal Palace Great Exhibition of 1851.

Dictionary Johnson’s favorite feline.

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

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

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

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

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

An alleyway plaque is all that remains of the independent Texas' envoy that forgot to pay their rent for over a century.

Rebuilt remains of a temple to Roman god Mithras.

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

A cluttered and astounding collection of antiquities and curiosities.

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

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

An unusual round church in London with a Templar past.

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

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

This shop and gallery is a modern-day cabinet of curiosities, unassumingly positioned along an urban thoroughfare.

A mechanized clock where a man fights off a dragon, crab, and rooster.

A museum of carnival attractions where you are invited to ride the rides.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

France's most famous cemetery, with some of its most curious tombs.

The oldest stone house in Paris was built by its most famous alchemist.

The macabre collection of Jacques Sirgent, an expert scholar on the undead and all of their trappings.

The vast, legendary catacombs hold secrets much stranger than stacked bones.