Bits of architecture from a town destroyed in World War I now decorate this hotel garden.

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.

A haunting collection of the vanished and disappearing natural world.

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

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

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

A favorite Paris bar for U.S. expats, including Gershwin, Hemingway, and James Bond.

The childhood home of Earth's alien chameleon is a humble Brixton flat.

This hidden green space is the city's second largest conservatory.

This landmark church concealed a crypt packed with bones that was discovered thanks to the London Blitz.

This London plaque marks the spot where David Bowie's famous alien made his debut.

The final resting place to 300 Victorian-era pets hides inside the city park.

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

In this cobwebbed old operating theater, you can practically hear the screams of the unanesthetized patients.

An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.

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

A kaleidoscopic warehouse-maze of handmade neon signs.

This churchyard arbor is surrounded by hundreds of gravestones placed there by author Thomas Hardy.

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

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.