This imposing tower named after the mythical sword of King Arthur is considered the tallest freestanding climbing wall in the world.

The world's largest collection of ships in bottles.

The history of sea-faring refuse and disaster is on cramped display in this Netherlands folk museum.

A luxury hotel housed in a former 15th century Gothic church.

The Rozenberg wind wall in South Holland makes for smooth sailing through the Calandbrug canal.

The largest flower auction house in the world.

The largest 19th century panorama in the world still in-situ.

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

This still-celebrated home was a radical architectural experiment in 3D De Stijl.

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

Lombardy poplars planted to imitate the size and shape of the Cathedral of Notre-Dame de Reims.

The works of poetry's biggest names grace the walls of the city of Leiden, all carefully painted by hand.

This unique bridge physically lifts a piece of the road into the air to let boats pass by.

Repurposed space and ultra-modern construction collide to create this geometric wooden spectacle.

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

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

Home to the world's oldest functioning orrery.

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

Strange secondhand shop showcasing taxidermy and oddies

Unchanged for centuries, this medieval library keeps its books in chains.

The place where houses are born.

Survival capsules find a second life as a unique hotel.

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

Two gravestones clasp hands over the religious divide.