The remains of a medieval wall discovered in the basement of a jewelry store.

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

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

Tucked away in the Leiden city hall are a group of works by famed artist MC Escher.

This historic Dutch newspaper building is covered with media-themed details—and one unrelated oddity.

A radio telescope for listening to the stars, based in one of the cloudiest countries in the world.

This giant radio telescope would be a rusting ruin if it hadn't become such a beloved relic.

This mountaintop observatory is home to one of the world's largest reflective telescopes.

A trio of red, white, and blue stones embedded in the streets of Leiden are markers of medieval territory and law.

A massive explosion that leveled hundreds of buildings in the city of Leiden is remembered by a waterside plaque.

The tallest waterfall in the Netherlands is a lovely, stepped feature that is only 50 feet tall.

A lecture hall sink once used by Einstein and other noted physicists is now regarded as a strange science relic.

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