This historical Netherlands fortress still bears the marks of its single siege.

Incredible labyrinth of man made caves.

A visionary precursor to the Internet made of index cards.

An installation that makes understanding the size of the universe a walk in the park.

A jazz band formed by African water animals in the heart of Flemish Brabant.

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

The Belgian library displays burned books that were salvaged from the fires of both world wars.

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

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

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

The tiny Belgian town's ancient version of Mardi Gras involves eerie wax masks, sticks for warding off evil, and ostrich plume hats.

Tintin's creator is celebrated in an immersive museum that's an astounding work of modern art.

This abandoned Belgian fortress is purposefully being left to nature.

A marble Lucifer hides behind the pulpit of this Gothic cathedral.

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

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

Carved into living stone, a beloved roadside chapel peacefully welcomes the faithful and curious alike.

This striking fort on the Maginot Line looks just as it did after being destroyed in the Fall of France.

A 600-year-old elm tree with a built-in seat and thatched roof.

Ancient man-made caves underneath small town Belgium.

A forgotten and crumbling Yugoslav monument to the victims of fascism.

A public work of art that also provides some relief from the summer heat.

A whimsical bridge adorned with decorative dragons.

In between two buildings in Ljubljana, medieval tunnel to nowhere.