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

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

This interactive sculpture allows visitors to leave a message in case a friend passes by.

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

Climb inside an iron crystal magnified 165 billion times its normal size.

Lavish royal estate punctuated with heated greenhouses.

From motorcycles to firetrucks and sports cars to horse-drawn carriages, this Belgian collection goes beyond rare cars.

A fascinating and enormous collection of natural history exhibits stained by a dark colonial legacy.

The "stairway to heaven" lookout tower was built to resist weather, arson, and the laws of physics.

No shoes allowed on this trail, which is designed to be experienced barefoot.

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

What was once a bustling mining installation is now a bustling hub of contemporary art.

Artwork tucked within the trees greets visitors with surreal sonic experiences.

This bike path traverses the treetops.

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

Part modern art project, part traditional chapel, this see-through church is only substantial from the right angle.

An early 20th-century sanatorium, long abandoned and now being reclaimed by nature.

This abandoned Belgian fortress is purposefully being left to nature.

Abandoned since 1998, this train station has become an oasis for urban explorers.

This giant urban staircase was built to keep the city's brave fighting men from getting waylaid in the red light district.

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

The vast chamber inside this abandoned cooling tower looks like something out of a sci-fi dystopia.