It is estimated that the first mills appeared as far back as the expansion of agriculture. For centuries, humans have used energy to power different grinding mechanisms.
Generally, the most basic mills consist of one fixed circular stone and one that moves. The latter rotates on the former, driven by energy from wind, water, people, or animals (forming windmills, watermills, mills powered by working animals, and so on). Over the centuries, mills were perfected so that it was possible to grind more material and achieve higher quality results with less effort.
Around the world, numerous regions have mills of different types from different eras. In Spain, the windmills of Castilla la Mancha are especially recognizable.