The research on the Caserta Royal Palace puts the drawing as a tool of knowledge, through critical inquiry, against some architectural exempla, whose explanatory story is not yet clearly be unraveled, the architectural design and, specifically, the relief of architectural works inherited from the past is a thorough knowledge of the process: a intellectual journey that allows, through the representation of the seized instrument, discretize, measure and capitalize, in the broad sense of its meaning, forget architectures are intended, therefore, to a sad fate of abandonment, decay and disuse.