The Moulins d'Alphonse Daudet are a small cluster of windmill sites near Fontvieille, west of Arles, associated with Daudet's Letters from My Windmill. The literary connection matters more than the scale of the monument: this is Provence as remembered through short stories, dry hills, and stone towers.
It works best as a short detour if you have a car or are already exploring the Alpilles and the countryside around Arles. Do not expect a major museum; the pleasure is in the setting and the link between landscape and literature.