Nowadays they are hardly in use in their original function, but are merely technical-historical monuments of a long tradition of craftsmanship: solely using the power of the wind as driving energy, the heavy millstones inside were moved and, for example, grains of grain were ground into flour (so-called grain mills ) or the oil is pressed from (e.g. olive) fruits (so-called oil mills). These old windmills are the best evidence that people were clever enough to harness the power of the wind centuries ago - long before the discovery of electricity and the resulting inventions.