Tag:historic=windmill
 historic = windmill
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A historic mill using the power of wind in its production process.  
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The tag historic=windmill can be used to map windmills which are out of use, but for which physical remains are still visible above ground. It can since have been assigned a new use such as a residence, a tourism=museum or retail (shop=* or amenity=restaurant) space which should be mapped separate.
The local name or label on old maps is usually derived from the product=* (such as "Corn Mill" or "Flour Mill") rather than the power source, in contrast to how we map on OpenStreetMap. See below for suitable tags for the product of the mill.
How to map
Depending on the state of the building and whether there is just one mill building or a complex of buildings, map as an area or a building relation with several building parts. The tag man_made=windmill is more common, but might not cover the historicity of the structure sufficiently. If the mill is no longer in use, you may use a lifecycle prefix such as disused.
If the mill has a name (sometimes after the location or the last miller), this can be mapped with the key name=*, historic:name and/or name:YEAR.
Add the usual tags available for buildings such as
Add wiki tags such as
Add other image sources such as
Many watermills are protected buildings, so you can add heritage tags such as
heritage=*ref:IE:niah=*for mills in the Republic of Ireland
To specify the former product=* of the mill, you may use historic:product=*. This often changed during the history of the mill, depending on demands (from woollen mill to flour mill, for example), so it might be useful to use semicolons between the products (ideally in chronological order) or dates, according the available sources, for example product:1839=wool or product:1839-1880=cut_stone. For Ireland and the United Kingdom, the old Ordnance Survey maps available as layers in JOSM and on maps.nls.uk are useful resources (see below).
You may want to add a description=* for anything you cannot cover in one of the suggested or other tags.
A tag for mills which are tourist attractions can be used on a separate node (tourism=attraction - see One feature, one OSM element). This might also require contact details etc. to be mapped.
Mappable items around the watermill
If the windmill has be turned into a tourist attraction, there might be amenities such as benches (amenity=bench), picnic tables (leisure=picnic_table) or bicycle or car parking or features such as defibrillators (emergency=defibrillator) nearby.
Information panels, commemorative plaques etc can be mapped, see tourism=information.
Gallery
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Windmill at Blennerville west of Tralee, Ireland -
Chesterton Windmill, England -
Zelden van Passe windmill, Netherlands -
Oldest windmill in the United States of America -
Lindos Windmill, Greece -
Windmill on Gozo, Malta -
Windmill in Poland
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