Covering approximately 4,000 hectares, the Parco regionale dell'Appia Antica (Regional park of Appia Antica) is the largest city park in Europe. It covers part of the municipal areas of Rome, Ciampino and Marino. The park includes via Appia Antica and the 16km surrounding it, the valle della Caffarella, the archaeological areas of Parco degli Acquedotti and the tombs of via Latina, significant for its numerous monumental tombs, the estates of Tor Marancia and of the Farnesiana.
The unique characteristic of this park is the combination of natural landscape with significant archaeological monuments, some of which, such as the tombs of via Latina, the mausoleum of Cecilia Metella and the circus and Imperial palace of Maxentius are perfectly conserved.
The first part of the park coincides with the Aurelian walls, where the via Appia passes through porta San Sebastiano. From here up to the belvedere di Cecilia Metella the road is enclosed on both sides by the border walls of the great aristocratic estates of the post Renaissance period. This is also the location for some of the most important Christian catacombs: San Callisto and San Sebastiano.
Further on, well-conserved monumental tombs stand on the road between the circus of Maxentius, the mausoleum of Cecilia Metella and the city ring road. After the ring road, the countryside opens up, with the large estates of the ager Romanus extending to the Castelli Romani.