An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

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

A 141-foot wave of crashing lumber guards the entrance to the Grand Place in Mons.

Petting this mysterious iron monkey supposedly brings good luck.

A garden of flying flowers.

The highest point in Belgium is a staircase to nowhere.

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

This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

This narrow Ghent alleyway is an officially sanctioned street art tunnel.

This ghost town in Belgium will lose its street art when it ceases to exist.

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

Climb inside an iron crystal magnified 165 billion times its normal size.

Meet the bronze beloved pet to a family of famous peeing statues.

Amsterdam's Red Light District leaves little to the imagination.

The 20-mile causeway that separates the Netherlands from the sea.

Building Men of War and Indiamen from Holland's Golden Age.

This enormous storm barrier is one of the largest moving structures on Earth, with each arm taller than the Washington Monument.

The struggle of a small Dutch island against the sea.

This giant wire frame man sculpture is crouched in contemplation.

This disused VLF radio station is no longer in service but the surrounding town still bears its name.

This unique bridge physically lifts a piece of the road into the air to let boats pass by.

The tallest waterfall in the Netherlands is a lovely, stepped feature that is only 50 feet tall.

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

Go inside a revolutionary, cage-less zoo where 70 species of monkeys roam free alongside their human visitors.