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

Visit the ancient, mysterious Roman catacombs ... in the Netherlands.

Incredible labyrinth of man made caves.

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

The giant scales in this museum can still tell if someone is one of the devil's brides just by weight.

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

This Netherlands museum holds a gloriously mechanical collection of ornate musical automata.

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

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

A unique collection of gilded age mechanical pianos.

A beautiful maze marks where three countries meet.

This unattributed sculpture in Amsterdam is hiding in plain sight.

A Portuguese Jewish cemetery filled with stunning grave monuments that date back to 1614.

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

A curious collection dedicated to human and animal anatomy and pathology.

An ancient passage filled with stalls selling used books, once frequented by Vincent Van Gogh.

The world's first zoo for microbes collecting the horrible and wonderful things living on and around us.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.