The intellectual accessibility complements the physical and sensory accessibility in the visit to the historical
buildings, understood as the perception of the historical - artistic values. The architectural scale of the historical cathedral, horizontal and vertical distances and visual angles, they prevent from estimating constructive details and decorations, and on the other hand, from understanding the religious iconography, if one does not possess previous information. In both cases, technological helps are needed for a good utilization of the itineraries of visit.