The bombed out remains of the old church were kept intact next to the new one, as a reminder of the futility of war.

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

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

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

The vast, legendary catacombs hold secrets much stranger than stacked bones.

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

Legendary site where an evil bishop was devoured by rodents.

This Luxembourg cave is covered in cryptic looking marks left by mining activity.

A memorial for a young woman and her ghost, which are claimed to have caused countless deathly shipwrecks.

This bike path was sunk below water level for maximum wonder.

Part modern art project, part traditional chapel, this see-through church is only substantial from the right angle.

No need to strap in for a "ride" on this walkable roller coaster.

This centuries-old gothic monster has been converted into a sprawling, glossy bookstore.

This historical Netherlands fortress still bears the marks of its single siege.

A Belgian self-built tower inspired by the Bible and ancient civilizations.

A once-magnificent collegiate church is falling into ruin.

This sprawling Belgian fort was once thought of as impenetrable but now it is simply an abandoned relic.

A marble Lucifer hides behind the pulpit of this Gothic cathedral.

This painted Lego bridge is the product of over a century of locomotive history.

This "floating railway" is one of the world's oldest monorail systems.

A fantastical bed and breakfast with magically unique rooms.

This bakery and museum offers tours of the tastes and mythology of Aachen's signature spice biscuit—just don't ask for the recipe.

A medieval gate once used as a prison and how home to a city museum.

Once the local rulers had gone these enchanting ruins housed common folk in an almost real life fairy tale.