Famed for its pie, this eatery has a hidden tunnel that allowed Catholics to secretly walk to church during the Reformation.

In the days before house numbers, these colorful signs held clues about various buildings' purposes.

A late-medieval Dutch castle with trick fountains in its whimsical water gardens.

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

This museum inside Amsterdam's largest cemetery explores how people deal with death.

This 1920s Amsterdam neighborhood was built as a giant experiment in concrete construction.

It appears as if a man is standing behind this giant airport clock, painting the hands in real time.

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

A collection of biblical memorabilia.

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

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

A true Valhalla for cactus and succulent lovers.

A UFO-shaped event building originally intended to be a science museum showcasing the future.

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

The ruins of this Dutch castle sit atop a labyrinth of once-secret tunnels and passageways, dating back over 900 years.

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

These slanted cubic abodes are a creative if odd solution to a zoning pickle.

Oldest Museum of the Netherlands is a true cabinet of curiosities.

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

Inspired by "The Starry Night" this Dutch bike path turns into a glowing work of art each night.

The world's only museum devoted to the wonders of fluorescence.