Tour a windmill in the Netherlands
Inside a working mill, the wind stops being weather and becomes machinery. Timber teeth engage overhead, shafts begin to turn and a landscape famous for still silhouettes reveals the noise and movement that once kept land dry or grain moving. Dutch mills served different purposes, including drainage, grinding, sawing and oil pressing. Kinderdijk shows windmills as one part of a larger water-management system, while other sites open interiors that make the gearing and the miller's work easier to follow. Choose a mill that confirms public access and its operating purpose, then check opening, wind conditions and interior restrictions shortly before travelling. Expect narrow ladders or steep stairs in many historic buildings, stay behind barriers and ask about ground-level interpretation when the full route is not accessible. Count it complete after entering an open mill and understanding how wind reaches the work it was built to do. Add it if the engineering behind the postcard is the part you most want to see.