Watch the local Netherlands birds from inside this giant eco-egg.

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

The world's longest wildlife overpass provides Hilversum's critters with a safe alternative to trying their luck on the roadway.

Made of 41,900 pieces of mosaic, it took two years to piece together this giant egg.

The Netherlands is home to a bridge printed out of reinforced concrete.

This giant wire frame man sculpture is crouched in contemplation.

This towering church is home to a world-famous organ and a treasure trove of medieval art.

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

This medieval castle was painted pink as part of a now-abandoned children's theme park.

This massive collection of taxidermy is full of specimens collected by missionaries during their international travels.

A monument hidden in the woods built in 1938 as a getaway for a Dutch museum curator.

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

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

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

This fairy tale forest hides scenes from some of the more obscure and bizarre Western nursery stories.

Incredible labyrinth of man made caves.

A unique collection of gilded age mechanical pianos.

Seven mini rowhouses fill the gap between 54 and 70 Westerstraat.