This bike path traverses the treetops.

Hiding the longest subterranean river known in the world.

A magical and peaceful ruined Cistercian abbey in what is now southern Belgium.

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

Lavish royal estate punctuated with heated greenhouses.

The vast chamber inside this abandoned cooling tower looks like something out of a sci-fi dystopia.

Ancient man-made caves underneath small town Belgium.

Also known as Napoleon's Canal, this waterway was created on the orders of the general, and construction was interrupted by Waterloo.

A maze of crosses marks the jumbled divide between the Netherlands and Belgium.

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

Sculpture designed by Turkish artist and professor Mehmet Ali Uysal.

Climb inside an iron crystal magnified 165 billion times its normal size.

This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

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

This abandoned Belgian fortress is purposefully being left to nature.

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

The "stairway to heaven" lookout tower was built to resist weather, arson, and the laws of physics.