This artificial ring island was built to hold cubic tons of polluted dirt.

The Netherlands' first car tunnel has an unusually rectangular shape.

An early 19th-century English style garden hidden in the Rotterdam cityscape.

This gigantic monument hidden in the woods was built to thank the Dutch for sheltering Belgian refugees during World War I.

The world's largest private telescope collection hides in a secret wing of a Dutch auto museum.

A radio telescope for listening to the stars, based in one of the cloudiest countries in the world.

The nerve center of a massive, state-of-the art radio telescope that sprawls across Western Europe.

This colorfully-painted tunnel links two distinct parts of a historic neighborhood.

An awe-inspiring giant blue whale jaw bone stands in the center of this Dutch island.

This giant wire frame man sculpture is crouched in contemplation.

The struggle of a small Dutch island against the sea.

The Rozenberg wind wall in South Holland makes for smooth sailing through the Calandbrug canal.

A giant floating rubber duck-bunny painted with a different design every year.

Hop aboard a charming bog train to explore this rare open-air museum of peat.

Made of 41,900 pieces of mosaic, it took two years to piece together this giant egg.

The elegant manor house where Kaiser Wilhelm II lived in exile after World War I.

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

The birthplace of most all of Europe's space missions is here on the Dutch coast.

An ancient Egyptian temple sits within a modern European museum.

This medieval castle was painted pink as part of a now-abandoned children's theme park.

This steel frame is a skeletal mirage of a lost 16th-century stone building.

Science meets wall art to highlight the beauty of famous mathematical equations.

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

The bridges portrayed on EU currency aren't fictional anymore.