One of the deepest indoor swimming pools in the world.

A little sculpture with a large wardrobe.

Theme park featuring miniature replicas of European monuments.

Cozy basement bar sports an inventory of over 2,000 beers.

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

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

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

Lavish royal estate punctuated with heated greenhouses.

Old ships and machinery fill a historic harbor in the city that's home to Europe's largest port.

This former hydraulic laboratory is now a woodland dotted with old engineering models.

In the Netherlands, one of the world's largest private car collections can be found.

The last of Amsterdam's original sea level markers remaining in place.

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

This large copper bolt represents the benchmark for measuring sea levels in most of Europe.

The world's largest collection of ships in bottles.

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

A preserved building where the dead were once watched for signs of life.

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

This 1920s Amsterdam neighborhood was built as a giant experiment in concrete construction.

A rare tour of an aristocrat's private home reveals valuable 17th-century paintings from artists like Rembrandt.

A public urinal so pretty, it was declared a national monument.

A grassy pyramid named after a French battle.

Birthplace of the "Cat in the Cradle" and a cluster of iconic, original windmills that let the Dutch tame the seas.

This beautifully designed star-shaped fort was the premier defense system of the late 1500s.