So Dutch firm RO&AD architecten designed an invisible bridge. Its construction is entirely made of wood, waterproofed with EPDM foil. The bridge lies like a trench in the fortress and the moat, shaped to blend in with the outlines of the landscape. The bridge can't be seen from a distance because the ground and the water come all the way up to its edge. When visitors approach, the fortress opens up through a narrow trench. Pedestrians can then walk up to its gates like Moses parting the waters.

Project architect: RO&AD architecten
Contributing architects: Ro Koster, Ad Kil, Martin van Overveld
Client: Municipality of Bergen op Zoom, the Netherlands
Structural Engineer: Adviesbureau Lüning
Contractor: AVK-bv
Materials: Accoya Wood, Angelim Vermelho
Total area: 50m2
Total Building costs: € 250,000




Stone: Origins and Future in Architecture
On June 12 and 13, 2025, IUAV University of Venice will host "Stone is…," an international forum entirely dedicated to natural stone. Organized by PNA, this event aims to thoroughly explore the material's enduring value and sustainability, featuring insights from internationally renowned speakers.