Kinderdijk, The Netherlands
Holland is traditionally associated with windmills. They marvellously fit in the flat countryside and you can find them almost everywhere. The biggest concentration of them is in Kinderdijk, a lovely place in the province of South Holland (Zuid Holland). Rightfully placed on the UNESCO World Heritage list and definitely a great place not to only take photos, but also just stroll any time of the year, any time of the day.
Attached you can find the official information site.