The growing interest in the conservation of architectural heritage and in ensuring safety of civil structures have encouraged, mostly in the last decades, the development of modern techniques of Structural Health Monitoring (SHM). As can be easily understood, it is really complex to thoroughly define the behaviour of historical buildings, for instance due to uncertainties on material properties, their actual conditions and used construction techniques. As well as, for civil structures, the high complexity and large dimensions can lead to a strong variety of local behaviours which are complex to be catch. In light of this, monitoring the health state of structures reveals to be quite useful both for evaluating the conservation status, from which design the interventions in a targeted way, and also to have a comprehensive health state scenario after sudden events like earthquakes.