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

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

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

This neighborhood of futuristic ball houses looks like an alien settlement in a science fiction film.

The world's first floating farm is staffed by one human, three robots, and 35 cows.

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

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

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

This small town in the Netherlands has no roads but instead, miles of canals and over 100 bridges.

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

An ancient Egyptian temple sits within a modern European museum.

The works of poetry's biggest names grace the walls of the city of Leiden, all carefully painted by hand.

This towering church is home to a world-famous organ and a treasure trove of medieval art.

This 22-floor tower's Skydeck offers panoramic views of Amsterdam.

This museum housed in a former brothel explores the past and present of sex work in Amsterdam.

Museum preserving torture methods from the past.

The history and future of cannabis.

Amsterdam's former hotspot for public executions and dissections.

One of Amsterdam's narrowest houses is located right across the canal from its widest.

The world's largest bicycle shelter can hold more than 12,500 two-wheelers.

Worship at the altar of seafood at this shop housed inside the town's oldest stone church.

A small Australian farmhouse became an international icon after appearing on a Midnight Oil album cover.

An opal mining town in the middle of Australia where people live, worship, and shop underground.

An underground city of salt.