This imposing tower named after the mythical sword of King Arthur is considered the tallest freestanding climbing wall in the world.

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

Picturesque intersection of witchcraft and ancient Christianity.

Elaborate tile work in this railway station tells the story of Portugal.

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

The location of the world's first telescope demonstration.

Despite centuries of architectural innovation, this French castle is being built like it's the 13th century.

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

Colorful and chaotic stacked hotel in North Holland.

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

Scale model of St. Peter's Cathedral (Rome) in the middle of a small Dutch town.

Hidden within a Netherlands crater is a stone bed that lets those who lie in it see the sky as a curved surface.

Take a stroll through the hellish grotesques of Hieronymus Bosch in this elaborate Netherlands church.

The largest 19th century panorama in the world still in-situ.

This fairy tale forest hides scenes from some of the more obscure and bizarre Western nursery stories.

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.

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

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

A 14th-century fortified keep showcases the masterpieces of an ingenious 20th-century clockmaker.

A maze of crosses marks the jumbled divide between the Netherlands and Belgium.

Its town washed away centuries ago, this lonely tower by the sea tells the tale of a mermaid and a curse.

A collection of weird and wonderful art fills a former houseplant nursery.

The legendary giant's severed hand sits on Antwerp's popular shopping street.

Most prolific publishing house in the 1600s open to the public.