This unassuming museum's slogan translates to “there is a limit of sadness, anxiety has no limits."

This beautiful natural train tunnel is said to grant the wishes of visiting lovebirds.

The largest collection of the iconic wooden shoe in the world.

Nestled in the woods lies this land art project: a hybrid between park, maze and natural monument.

This museum is filled with an eclectic collection of unique inventions.

A set of seven houses, each built in a style that represents a European country.

A museum-like shop that has been producing clogs, brushes, and ropes for nearly 200 years.

This artificial ring island was built to hold cubic tons of polluted dirt.

An impressive array of unique homemade planetariums.

Old ships and machinery fill a historic harbor in the city that's home to Europe's largest port.

A sanctuary for sickly, stray, or wounded donkeys.

This Dutch art piece became a Russian icon.

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

A modern reimagining of a medieval city gate.

This enormous storm barrier is one of the largest moving structures on Earth, with each arm taller than the Washington Monument.

This former hydraulic laboratory is now a woodland dotted with old engineering models.

The place where houses are born.

A Dutch clog company in the town of Zaandam loves the wooden shoes so much it made a museum for them.

This steel frame is a skeletal mirage of a lost 16th-century stone building.

A 1:20 scale piece of the Netherlands commissioned by a queen lets visitors take a stroll as giants.

A set of 27 bamboo tubes creates an eerie soundscape that changes with the wind.

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

Devious political maneuvering and four ancient, working telescopes are central to the world's second-oldest observatory.

Pull up and have a drink at a museum filled with hundreds of years worth of shipwreck artifacts.