An ancient passage filled with stalls selling used books, once frequented by Vincent Van Gogh.

The world's first zoo for microbes collecting the horrible and wonderful things living on and around us.

Amsterdam's former hotspot for public executions and dissections.

This 17th-century manor house provides a fascinating glimpse into old-world Mallorcan life.

This marine reptile was discovered by one of the 19th century's greatest fossil hunters.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

The cedar tree in Highgate Cemetery earned its title by accident.

According to a satirical conspiracy theory that persists today, this German city of 300,000 is a hoax invented by the CIA.

The small alleys in Lübeck's Old Town are a result of medieval urban sprawl.

Hamburgers are intensely proud of their tunnel beneath the river.

The Tudor-style cottage in the middle of the square is not quite what it seems.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

Mary Kelly was last seen here before she was murdered by Jack the Ripper.

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

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

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

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

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

These official units of measurement—including chains and perches—lie hidden beneath tourists' feet in a popular London hub.

This South London cemetery holds the remains of more than 15,000 people.

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

The signs of a long buried road can still be found hidden beneath a London sewer grate.

Installed at a chaotic intersection, this gave London traffic cops a place to hang their heavy woolen coats.

The largest prehistoric cemetery on the Balearic Islands dates back over 2,500 years.