Yeah @Librarymouse, Kinderdijk is nice, a bit too touristic, just like the Zaanse Schans. I know some beautiful spots with windmills in a part of Holland, near the polders of Beemster and Schermer. Some of them nicely and historicly correct rebuild.
Ah @Chaud, the history of the Netherlands (the Lowlands), including parts of Belgium (Flanders, Brabant, Artois) is interesting, because of the trade we had from the Middle Ages on - the Friesians started it, the Flemish cities Brugge Gent and Antwerpen moved on and then the free Republic had its Golden Age - and the art and craftmanswork we made here.