Piezometrica tower and Pacis gate
The original Porta Pacis (now closed and not to be confused with the twentieth century opening) is currently positioned at the point where the walls form a right angle before continuing linearly. The opening of the Supra Castellum gate, so originally called, seems to be contemporary with the construction of the walls. Since 1380, the gate is mentioned in documents as Pacis, perhaps from the name of the ancient Pisan noble family Della Pace, owner of some adjacent plots of land.
Via Vittorio Veneto, 19