The former headquarters of history's oldest megacorporation.

The former home of a mad diplomat is said to still be marked in bloody, arcane scrawls.

One of Amsterdam's narrowest houses is located right across the canal from its widest.

Three connected pink triangles memorialize persecuted gays and lesbians throughout history.

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

A beautifully eclectic mix of architectural styles.

This historic Amsterdam bar used to accept sailor's monkeys as payment.

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.