In this paper, we build a subsurface model that helps us to visualize and understand the structural framework and geology, along with their interactions, in the Mt. Amiata geothermal system. Three-dimensional (3D) modeling provides the possibility of interpolating the geometry of structures, and is an effective method for understanding geological features. The 3D modeling approach is crucial for further progress in the reconstruction of the assessment of the geothermal model of Mt. Amiata. Furthermore, this model can be used as the basis for a 3D numerical thermo-fluid dynamic model of the existing reservoir(s). The integration of borehole data and the numerical modeling results allows us to reconstruct the temperature distribution in the subsoil of the Mt. Amiata area.