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

It's forbidden to dig within this ancient Roman fort hidden beneath a playground.

This public toilet built in the famous Amsterdam School architectural style is a Dutch national monument.

Once housed in the towers of this Gothic church, this 17th century clock still ticks today.

Once the world's biggest telescope, it was later used as a coat hanger by a famous Dutch astronomer.

A tiny house showcases the busy life of a local gnome.

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

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

This Dutch art piece became a Russian icon.

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

A former plague hospital turned medical museum.

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

A 'living museum' in Leiden, the oldest of its kind in the Netherlands.

The last of Amsterdam's original sea level markers remaining in place.

Where royalty waits in the height of luxury.

Tucked in the back of a flower shop, its collection details the fascinating history of the Netherlands's iconic symbol.

A public urinal so pretty, it was declared a national monument.

This pirate-broadcasting-tower-turned-restaurant played a rebellious role in the history of Dutch television.

An overgrown and largely forgotten cemetery lies hidden within the outskirts of Amsterdam.

This subterranean studio is filled with fascinating kinetic art.

This cheese shop also houses a museum devoted to Dutch dairy.

A Dutch passageway's artistic, aquatic-themed makeover pays tribute to the capital city's famed waterways.

This 22-floor tower's Skydeck offers panoramic views of Amsterdam.

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.