An early Portuguese serial killer's head is alarmingly well preserved in a jar at the University of Lisbon.

This former Masonic lodge has been transformed into part museum, part bar, all awesome.

This museum is housed in an unassuming building that witnessed one of the most daring feats of satire in modern history.

This collection of solar timekeepers includes the world's first digital sundial.

A garden of flying flowers.

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

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.

This former coal mine, now a fascinating museum, was the site of Belgium's worst mining disaster.

Abandoned since 1998, this train station has become an oasis for urban explorers.

In the shadow of a former battleground, the resting place for nearly 2,000 soldiers who died in World War I.

This old, abandoned hotel offers magnificent views.

An early 20th-century sanatorium, long abandoned and now being reclaimed by nature.

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

This memorial museum chronicles the apocalyptic destruction of the First World War.

Inside this former medieval prison is a collection of objects designed to inflict unbelievable pain and suffering on the human body and mind.

A museum celebrating the Canadian forces that liberated Belgium from the Nazis replete with battlefield miniatures and multiple Gardens.

This Belgian palace was long the domain of priests and aristocrats but is now being turned into an art commune.

A moving memorial to the fallen and missing from WWI trenches.

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

A Cold War command center is hidden under an idyllic countryside.

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.

An open-air sewer system that was covered piece-by-piece over 300 years.