Take a leisurely walk through the park to find the seven giant troll sculptures hidden throughout the park.

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

This skewed English house has looked like it's going to fall over for centuries.

One of England's most famous churches hides a pair of little known architectural treasures.

A set of medieval stained-glass windows tell the gruesome story of a Viking siege.

This foreboding medieval castle was twice besieged by barons rebelling against the English king.

The rotting skeleton of a shoreside fun fair that was destroyed by fire and storms still haunts the Brighton ocean view.

An abandoned tank sits in an empty London lot as a symbolic middle finger to local city planners.

An architectural oddity hides in plain sight on this iconic London bridge.

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

In this cobwebbed old operating theater, you can practically hear the screams of the unanesthetized patients.

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

Each time a baby is born in Ghent, these streetlights flash in silent celebration.

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

This palatial spiral staircase was so unusual the name "snail" was given to the noble family who built it.

An extensive collection of reliquaries containing the bones of saints housed in the largest Catholic church in Venice.

Go inside to really appreciate this 500-year-old technological masterpiece.

Two stone columns flank the grand Venice square, but there were supposed to be three.

Where Venice's gondolas go for a tune-up.

This Belgian theme park began as a refuge for bored church children and was closed down when a boy lost an arm.

Museum in a swimming pool where the water still flows.

A castle-like sea fort from the 17th century is now a museum to oyster farming.

Abandoned railway line circling the city of Paris.

A Dutch passageway's artistic, aquatic-themed makeover pays tribute to the capital city's famed waterways.