Rich with fauna and flora, nature-lovers can walk across the sea at this UNESCO World Heritage spot.

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

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.

Colorful and chaotic stacked hotel in North Holland.

This bird-loving brewery is situated in an old municipal bathhouse, nestled beside a 300-year-old windmill.

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

A floating cat sanctuary on an Amsterdam canal.

This bike path traverses the treetops.

This bike path was sunk below water level for maximum wonder.

Rare wooden escalators lead deep down into an otherwise staggeringly monotonous tiled tunnel.

This abandoned Belgian fortress is purposefully being left to nature.

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.

Each spring, a dreamlike carpet of bluebells overtakes the forest floor.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

This former quarry is now a picturesque gorge that hides a sunken lake.

Europe's largest natural bridge has a 19th century royal chateau built into its side.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

This artificial cave looks like something out of a fairytale.

Countless grotesque faces stare out from this eerie Prague art wall.

The oldest wind turbine in Europe, constructed by a group of friends in 1932.

A collection of modern and vintage pinball machines housed in the cellar of a 15th-century building.