It is in this wooded parkland, riddled with paths, that the Aniene river runs through a narrow ravine dotted with waterfalls. The water pours into the Great Waterfall, the Caves of the Siren and Neptune. After walking along the bank on the other side of the ravine, you will leave Villa Gregoriana by the Temple of Vesta, an elegant circular construction in the Corinthian style dating from the end of the Republic.