In Xabia Spain in the Montgo Natural Park from around the XIV to the XVIII centuries, eleven cylindrical windmills were built and since then have been well preserved. Each of them being seven metres high and over 6 metres in diameter. These windmills were built to grind wheat and other cereals. They used wind power to rotate the large sails which worked using a strong wooden mechanism hosted on the upper floor of the windmills. In turn, it moved the large circular millstones which converted grain into flour.