 Quite similar to the ancient "Porta Decumana", built into the medieval structure of the present-day Palazzo Madama, the Palatine Gate represents an example of a typical Roman gate facing a "cavaedium" (quadrangular courtyard on the inside of the city walls), the remains of which are placed in front of the gate.Erected on a square base, the two angular towers are more than thirty metres high and feature a sixteen-sided structure.The central body, namely the "interturrio", is about twenty metres long and is characterized by two orders of windows, the lower one composed of arch windows and the upper one made up of jack arch windows.