By Xah Lee. Date:
A close up of a dilapidated windmill. This type of windmill is called American Style windmill. They are used to pump water. Photo taken at a rest stop on highway I80, Walnut, IA, USA. 2004-09-30.
Spanish Windmills at La Mancha. (photo source )
windmill Harlem
A Windmill in Haarlem, Netherlands. (Photo by Herrick. source)

For more info about Windmills, see Wikipedia: Windmill