Thirty creepy ghosts now inhabit this decaying 14th-century church.

This ghost town in Belgium will lose its street art when it ceases to exist.

This abandoned Belgian fortress is purposefully being left to nature.

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

Incredible labyrinth of man made caves.

A marvel of technology a century ago, this disused power station now offers a lovely glimpse into the industrial design of the past.

Possibly the world's largest hourglass only needs to be reset every New Year's Eve.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

This Budapest bar allows drinkers to leave their mark on the walls, floor, and even ceiling.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

The beautiful baroque library of the Hapsburg empire.

The world's most important buildings shrunk to a tiny size.

Model Trains and Much More in Hamburg.

Once the tallest building in the world, this abandoned church is now a monument to the destruction of WWII.

Copenhagen's celebrated theme park and gardens.

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