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

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

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

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

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

Longest canal tunnel in the world, abandoned in the 1960s.

This historic island prison holds one of the dungeons from the Count of Monte Cristo even though it is a work of fiction.

This abandoned island off the Venetian coast has been a radical monastery, a political prison, and a secret Nazi base.

The plague quarantine island home to the alleged "Vampire of Venice."

This community on a small Venetian island has taken to painting their houses in bright neon hues.

Museum celebrating the ocean, with the largest wunderkammer dedicated to sea exploration.

This 135-year-old weather station studied the effects of the climate on human health.

This scale model of our solar system hid in plain sight for years before a physics team sought out all the planets.

Austria's ultra-modern art museum looks like Cthulhu's giant alien heart.