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

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

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

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

This Belgian palace was long the domain of priests and aristocrats but is now being turned into an art commune.

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

Descend into the tunnels to experience the life of a coal miner.

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

A beautiful maze marks where three countries meet.

The tallest mountain in mainland Netherlands isn't actually very tall.

This bakery and museum offers tours of the tastes and mythology of Aachen's signature spice biscuit—just don't ask for the recipe.

This massive collection of taxidermy is full of specimens collected by missionaries during their international travels.

The only bicycle museum in the Netherlands charts the invention of the now-ubiquitous two-wheeled machine.

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

A large measuring stick marks the lowest point of a country that is partially under sea level.

Yup, that's a 330-foot yacht passing over the highway.

A true Valhalla for cactus and succulent lovers.

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

An early 19th-century English style garden hidden in the Rotterdam cityscape.

An icon of International Style architecture on the outskirts of Rotterdam.

A nuclear reactor created for Eisenhower's "Atoms for Peace" campaign is now used for research at a Dutch university.

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

The location of the world's first telescope demonstration.

Strange secondhand shop showcasing taxidermy and oddies