RAU Architects and Ro&Ad Architects have designed the egg-shaped Tij Observatory for the Scheelhoek Nature Reserve in Stellendam, the Netherlands, which can be taken apart and rebuilt elsewhere. More about Thatched reeds cover egg-shaped observatory for watching birds
The next bridge featured in the Dezeen A-Zdvent calendar is almost invisible, sunken down below the surface of a moat outside a historic Dutch fort. More about Dezeen's A-Zdvent calendar: Trench Bridge by RO&AD
This floating wooden bridge by Dutch studio RO&AD snakes across the surface of a moat surrounding an 18th-century fortress in the city of Bergen op Zoom (+ slideshow). More about Floating bridge by RO&AD crosses the moat of a Dutch fortress
This bridge across the moat of a historic Dutch fort leads visitors below the water’s surface without getting them wet. More about Sunken Bridge by RO&AD