This paper summarises research on former mental hospitals in the areas of the former State of the Church (Latium, Marches, Umbria, Emilia), in addition to the four cases outside the papal territories (Reggio Emilia, Piacenza, Parma Colorno and Forlì). The first objective of the investigation was the history and architecture of the individual buildings which must be reflected closely in the hoped for action to protect and enhance them. In order to achieve this second objective, the information acquired was processed in order to be able to use it also for these purposes. Three case histories were briefly considered (Macerata, Rome, Reggio Emilia) chosen from the seventeen analysed as examples to illustrate the work performed.
Keywords: Type; mental hospitals; protection