The research presented in this book examines a very particular context. The "Borgaccio" area, in the municipality of Pieve Vergonte (VCO), is known for the presence of an isolated wall, approximately 20 meters long, generically dating back to the Middle Ages, visible a few meters from the right bank of the Toce river, in a large lawn area. Local tradition has always considered this wall as a trace of the medieval past of Vergonte, the ancient capital of the district, destroyed by terrible floods during the 10th century. The volume collects the results of the investigation carried out by the Ca' Foscari University of Venice and the University of Padua through aerial photogrammetric and thermographic surveys, the study of historical cartography and historiographical documentation, magnetometric investigations, GPR (Ground Penetrating Radar), ERT (Electrical Resistivity Tomography), manual and mechanical core drilling. In agreement with what could already be understood at the start of the research, the surviving wall of Borgaccio was part of a complex comparable to the model of the "recipes", i.e. fortified medieval villages, usually built to conserve and protect assets. The overall plan of the documentable evidence is also common to that of the so-called "free villages", demic nuclei founded by the municipalities with the aim of controlling and managing large territorial sectors. The state of conservation of the structures pertaining to the Borgaccio complex is extremely incomplete. Local tradition has always motivated this circumstance by hypothesizing destruction caused by disastrous floods of the Toce, documented since the Middle Ages. However, this hypothesis is denied by the stratigraphic investigation conducted underground up to XNUMX m depth from the ground level. In fact, there are no obvious traces of structural collapses or extensive levels of rubble, nor indicators of a stable human presence. It is therefore more probable, and this is the hypothesis taken into consideration in the book, that the hydrographic instability of the area, probably underestimated at first, dissuaded the builders from completing the construction of the village, and motivated, in final analysis, the transfer of the seat of power to the opposite bank, to the town of Vogogna.