Eastern Iran is less known and more authentic; even if I am Iranian, I was surprised to see many things that I had not seen before.
It is said that necessity is the mother of invention, and we can see it squarely in Windmill, ancestors of wind turbines used to grind grains by strong and violent winds. No one knows where these mills come from because you can find them all over the world.
In Iran, the oldest records relating to this type of mill date back to the 10th century, but this dates back to ancient times (before Islam). The first windmills in Iran were built in the Sistan region (Sistan, the cradle of windmills; today shared between Iran and Afghanistan). Nowadays, the best-preserved of Iran is in the city of Nashtifan south of Khorasan-e Razavi, 18 km south of Khaf (120 days of Sistan wind it works well). In Nashtifa, it exists today 'about 33 mills dating back to the Safavid era and some of them are still in operation. When I was there, some of these windmills were not in good condition, but I was told that they were under repair and that the site was closed in order to analyze the basement where the grain was ground.