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

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

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

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

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

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

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

A Parisian boutique devoted to la Sape, the elegant Congolese fashion subculture rooted in European colonization.

Collection of antique taxidermy and natural specimens, near one of Paris's oldest flea markets.

A Belle Epoque bordello turned into a themed love hotel.

A font of vintage porn on the silver screen.

An all-American grocery store in Paris sells U.S. "cuisine" like Pop-Tarts and Heinz ketchup to homesick ex-pats.

Inside a former cabaret, seven floors of erotic art.

The celebrated eyesore created by starry-eyed sweethearts.

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

A giant silver apple a day keeps the perils of capitalism away.

A melancholy jester sits on the grave of a famous 20th-century ballet dancer and choreographer.

For more than a century, revolutionary graffiti has marked the wall of a Parisian church.

A tribute shrine where the Space Invasion street art movement started.

The remains of the medieval wall that once surrounded Paris with ties to the construction of the Louvre.

The tombstone of an unfortunate explorer who disappeared in the Paris Catacombs.

This small, ingenious cannon once helped regulate Parisian life.

The heaviest gold coin ever minted.

One of Jeff Koons’s largest sculptures and his first commemorative work.