Quartiere XXI Pietralata on Tavola 43, with the Aniene looping across the top above a pale street plan and the village of Pietralata at lower centre.
Source: Old map, public domain
A railway line cuts down the left margin, and a large lot numbered 83 stands in the middle of an otherwise empty grid. The fort is lettered on a hilltop above the village, and Ponte Mammolo and Collatino are named at the right.