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

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

A Parisian cemetery where the elite and artistic are interred beneath an eccentric collection of tombs.

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

This frog-themed restaurant was frequented by Picasso, Saint-Exupéry, and more.

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

Abandoned railway line circling the city of Paris.

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

Along the most northwestern point in Africa is an ancient cave surrounded by legends.

The world's first underground farm is in a World War II bomb shelter beneath the streets of London.

Eighty million natural history specimens call this gargantuan museum home.

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

Several plaster noses are hidden in plain sight around London's Soho neighborhood.

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

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

A kaleidoscopic warehouse-maze of handmade neon signs.

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.

These miniature works of art are hiding in plain sight on buildings around the city.

This tiny Swedish troll protects the land and all who wander within it.

A replica of the beloved character's house, modeled after the author's own drawings.

Uppsala's adorable feline sign celebrates a popular children's book set in the Swedish city.

This encrypted monolith protected a secret of Norse mythology by hiding in a church wall for over a millennium.