Residence Quadrangle and northern sector of the Residence, looking southwest

The ancient Via Tiburtina left Rome through the Porta Tiburtina (now the Porta San Lorenzo) and ran eastward fairly directly across the Campagna, the low but gullied and undulating plain of the Roman countryside; the modern Tiburtina mostly follows the same line. A branch line leading to the Villa left the Tiburtina about 5 kilometers southwest of Tivoli, crossing the Aniene on an ancient bridge, still standing and now called the Ponte Lucano (fig. 10). Half a kilometer further along, a road …