A 14th-century fortified keep showcases the masterpieces of an ingenious 20th-century clockmaker.

An ancient monastery, a locked room, and a mysterious book heist.

A Museum of Psychiatry in a still-operating mental institution.

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

This narrow Ghent alleyway is an officially sanctioned street art tunnel.

This abandoned Belgian fortress is purposefully being left to nature.

Museum covers every step of the chocolate-making process, from cultivation to the finished product.

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

Three floors of musical instruments coming from all corners of the world and hundreds of years of musical history.

One of the deepest indoor swimming pools in the world.

Each spring, a dreamlike carpet of bluebells overtakes the forest floor.

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

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

Petting this mysterious iron monkey supposedly brings good luck.

An underground city of ancient quarry tunnels hid thousands of Allied soldiers in WWI.

Two small chapels housed inside an ancient tree.

The somewhat misnamed 'Garden of Shells' lovingly built from found objects.

Jean Tinguely's bizarre monster sculpture is hidden deep in a forest.

The post-apocalyptic remnants of a bucolic town ruined by a plane crash.

Shattered columns and Egyptian pyramids outside of Paris.

1920's reinforced concrete church by architect Auguste Perret changes the face of modern design.

The macabre collection of Jacques Sirgent, an expert scholar on the undead and all of their trappings.

A charming flea market shop dedicated to retrofuturistic apparati.

France's most famous cemetery, with some of its most curious tombs.