Monsanto can be seen on the side of a great steep skid, called the Pillory of Monsanto (Mons Sanctus). It is located northeast of Guarda and suddenly breaks out of the field. At the highest point, its peak reaches 100 meters. The human presence in this place dates back to the era of Dom Afonso Henriques. Archeology tells us that the place was inhabited by barbarians, at the foot of the mountain.