Windmill and sluice on the canal, Kinderdijk, UNESCO World Heritage Site, Molenwaard municipality, South Holland province, Netherlands, Europe

Sluice gate, lock gate Hindenburg, Hannover Anderten, lower saxony, Germany

Lock and houseboats in a canal in Knowle, West Midlands, England, Great Britain, Europe

Eider Barrier on the mouth of River Eider near Toenning - largest German coastal protection building, Schleswig-Holstein, Germany

Base of the old siet gate with historical inscription, Nessmersiel, East Frisia, Lower Saxony, Lower Saxony Wadden Sea National Park, Germany, Europe