This 11th-century castle sits so low you can't see it behind the surrounding buildings.

A nearly 25-foot concrete sculpture of Sylvette, Picasso's muse.

Four giant movable street lights decorate this modern Rotterdam square.

Now a museum, this building was once a 14th-century monastery and the place where the founder of the Dutch nation lived and was assassinated.

Rotterdammers' dirty minds gave this santa a dirty nickname and cursed it to a life of wandering.

The largest flower auction house in the world.

A miniature city, once ruled by the Queen of the Netherlands.

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

These slanted cubic abodes are a creative if odd solution to a zoning pickle.

This centuries-old gothic monster has been converted into a sprawling, glossy bookstore.

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

Unsurprisingly, Holland is home to one of the most magnificent flower gardens in the world.