Ancient man-made caves underneath small town Belgium.

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

One of Belgium's oldest hospitals saw patients from the 13th to 20th centuries before becoming a museum.

Nature is slowly overtaking this disused cemetery on the outskirts of Brussels.

Most prolific publishing house in the 1600s open to the public.

This bike path traverses the treetops.

The patron of this extravagant Art Nouveau confection insisted that nothing less than a boat should project from its facade.

The Belgian royal family's private depot now stands abandoned and forgotten alongside the tracks.

A wonderfully kitsch bookstore the size of a supermarket.

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

This recently restored crypt was once plagued by liquefying coffins and exploding caskets.

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

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

Hiding the longest subterranean river known in the world.

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

Lavish royal estate punctuated with heated greenhouses.

Strange secondhand shop showcasing taxidermy and oddies

Take a stroll through the hellish grotesques of Hieronymus Bosch in this elaborate Netherlands church.

This unusual elevator doesn’t stop or slow down.

Crouch down, stretch tall, and be sure to flail your legs to pay homage to the Monty Python classic.

One of Amsterdam's narrowest houses is located right across the canal from its widest.

This museum inside Amsterdam's largest cemetery explores how people deal with death.

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

A former plague hospital turned medical museum.