A replica of the home of a famous fictional troll family.

The world's largest bamboo labyrinth is a living demonstration of the plant’s immense potential.

At night, bats patrol this magnificent 18th-century space in search of book-eating pests.

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

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

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

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

A 400-year-old church covered floor to ceiling in ex-voto offerings from the faithful.

The remaining relics of the patroness of Paris lie in a chapel under a striking double spiral staircase.

This little-known relic crypt holds stolen parts of a Roman Empress.

Skeletons, medical artifacts, and other obscure and precious treasures all displayed in a wooden pharmacist's cabinet.

A popular shrine where the Blessed Virgin allegedly appeared in 1830, displaying a holy armchair and two incorruptible remains of Lady Saints.

This surreal statue brings a famous French novel about a supernatural cad to arresting life.

A unrivaled and rather horrifying collection of wax dermatological models.

Down a cobblestone alleyway is a museum dedicated to Romanticism, with a secret garden.

This museum houses an imposing skeleton army comprised of creatures great and small.

France's national museum of scientific and industrial instruments.

A scandalous Art Nouveau collaboration that set Paris all atwitter at the turn of the century.

A haunting collection of the vanished and disappearing natural world.

One of the oldest medical collections in Europe focusing on rare surgical instruments.

This massive library holds what was once the largest book collection in the world.

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

A terrific purveyor of natural history objects and curios.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.