When I share windmill pics to my friends in Japan, they never know what they are because it's always the first time they see them!
My roots are in the Castilla-La Mancha region, so I feel very connected to this kind of landscape :)
I think the best windmills can be seen in Campo de Criptana and Consuegra.
In this pic you can see those at Campo de Criptana. If I am not wrong, Don Quixote had a fight against these windmills while thinking they were giants.
Travel in Spain