The Porta Maggiore, or Porta Prenestina, is one of the eastern gates in the ancient but well-preserved 3rd-century Aurelian Walls of Rome.
Through the gate ran two ancient roads: the Via Praenestina and the Via Labicana. The Via Prenestina was the eastern road to the ancient town of Praeneste. The Via Labicana heads southeast from the city.
Wikipedia https://en.wikipedia.org/wiki/Porta_Maggiore
Address Junction of Via Eleniana, Via di Porta Maggiore, and Via Casilina, Rome, Latium, 00184, Italy
Coordinates 41°53'29.054" N 12°30'54.59" E