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

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

This abandoned Belgian fortress is purposefully being left to nature.

Descend into the tunnels to experience the life of a coal miner.

The ruins of this Dutch castle sit atop a labyrinth of once-secret tunnels and passageways, dating back over 900 years.

Visit the ancient, mysterious Roman catacombs ... in the Netherlands.

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

This bike path traverses the treetops.

Incredible labyrinth of man made caves.

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

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