This historical Netherlands fortress still bears the marks of its single siege.

Incredible labyrinth of man made caves.

This centuries-old gothic monster has been converted into a sprawling, glossy bookstore.

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

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

Unknown to many, this is where items not displayed in a Dutch history of science museum are held.

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

An ancient Egyptian temple sits within a modern European museum.

Graffiti covers the walls of a room where university students through the centuries have waited nervously to defend their theses.

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

People have been placing babies on these lilies for photoshoots since the Victorian era.

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

Albert Einstein would often sit in this chair during visits to the observatory to discuss science with Willem de Sitter.

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

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

For over 100 years the most important physicists in the world have autographed this university wall.

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

The world's first interactive human body museum also serves as a chair for a giant orange man.

A nuclear reactor created for Eisenhower's "Atoms for Peace" campaign is now used for research at a Dutch university.

Now a museum, this building was once a 14th-century monastery and the place where the founder of the Dutch nation lived and was assassinated.

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

In the Netherlands, one of the world's largest private car collections can be found.

The world's largest private telescope collection hides in a secret wing of a Dutch auto museum.

Survival capsules find a second life as a unique hotel.