The fantastic architectural models of a French traveler.

This Paris art space celebrates the creativity and ingenuity that springs from abject poverty, especially in Africa.

The largest underground church in Europe.

Historic medieval fortified city in southwest France.

A 14th century bridge built as a fortress, where the devil lurks on one of its towers.

An overlooked marble is the only surviving in-place 18th century example of the measurement that changed how we define distance.

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

This noble mash-up in eastern Luxembourg is part Medieval, part Renaissance, all castle.

This tri-part waterfall is a little bit of fairytale beauty in the heart of Luxembourg's Little Switzerland.

Once the local rulers had gone these enchanting ruins housed common folk in an almost real life fairy tale.

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

You would never come across this tiny green oasis if you didn't know it existed.

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.

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.

Drink among marionettes at this pub inside a historic puppet theater.

To enter this cluttered-yet-cozy sanctum of Belgian brews, ring the bell and tell the gatekeepers you've come “to taste beer.”

A collection of weird and wonderful art fills a former houseplant nursery.

This bike path traverses the treetops.

A giant bug impaled on a 75-foot-tall needle.

Each time a baby is born in Ghent, these streetlights flash in silent celebration.

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