This still-celebrated home was a radical architectural experiment in 3D De Stijl.

A historic observatory now an astronomy museum beautifully situated at the moat of the Middle Age city centre.

This gigantic monument hidden in the woods was built to thank the Dutch for sheltering Belgian refugees during World War I.

Two gravestones clasp hands over the religious divide.

An impressive array of unique homemade planetariums.

Where lovers tie birch branches into long-lived knots.

Scale model of St. Peter's Cathedral (Rome) in the middle of a small Dutch town.

An idyllic hotel that gave its name to a supposed shadow government.

A relic of the old jail still stands in its original location.

This public library and its impressive collection of academic books have not changed since the 17th century.

This 11th-century castle sits so low you can't see it behind the surrounding buildings.

This stately council chamber hasn't changed since 1545.

The struggle of a small Dutch island against the sea.

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

Lombardy poplars planted to imitate the size and shape of the Cathedral of Notre-Dame de Reims.

The location of the world's first telescope demonstration.

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

Home to the world's oldest functioning orrery.

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

Live out your childhood construction fantasies in this one-of-a-kind gyrating hotel.

A seven-century-old jail tells a not-so-pleasant history of crime and punishment.

Strange secondhand shop showcasing taxidermy and oddies

The world's largest collection of ships in bottles.

A preserved building where the dead were once watched for signs of life.