I visited the Molino viejo de Zabala, west of Cartagena. It is indicated on this website as one of the locations of this nomination though I didn't find out why since I didn't find it in the nomination a there are hundreds more. There are also larger groupe of windmills what would increase the pleasure of the visit. As far as I could see they seem all protected.  This single mill is small and about 300 years old. Tt is rightfully preserved but it is a very simple construction and I doubt it varies greatly from similar mills in Greece or the Balkan. If you have experienced the incredible complexity of dutch mills, for example at Kinderdijk or even more in Zaandam with many different functions and technical finesses there seems little reason to inscribe the Spanish mills.