An archaeological investigation was made of the southern entrance area and the area above the amphitheatre. A new entrance was opened to the monument from the road (via Cuma – Licola, in the town of Bacoli) and excavation of the vaulted entrance corridor was completed. A number of spaces were identified, accessible through doors on both sides of the corridor. These comprised two vomitoria which gave access to the south sector of the ima cavea, a tract of the circular ambulacrum of the arena and a small intermediate space of uncertain use. Excavation of the cavae revealed the seating tiers below a layer of agricultural soil varying in depth between 40 and 80 cm, The seats were robbed of their cladding, and partially and sporadically preserved. In the zone above the amphitheatre, near the Villa Virgiliana, a trench brought to light an imposing terrace wall, with several construction phases from the archaic Greek period to the Roman period. This was probably the structure which to the east contained the terrace of the presumed temple, whose presence, in connection with the topography of the summa cavea of the amphitheatre had already been hypothesised in the 19th century. The archaic wall built up against the terrain, constituted by a curtain of orthostats and an internal fill of large tufa flakes, was abutted by later rebuilds: a second structure with a curtain wall of blocks and emplekton of chippings with transverse bonding, and an opus reticulatum wall of late Republican date, abutted in the imperial period by another in opus vittatum.

The Liberty style Villa Virgiliana was constructed over the temple building. A trench placed in correspondence with the eastern wall of the structure ascertained the presence of deep foundations, relating to a wall of the Roman period on which the modern construction rests.