In 2015 archaeological investigation at the Villa of the Antonines was conducted in two distinct areas: the main one where the amphitheater and the baths are (Area 1), and another (Area 2) 150 m uphill where the 2014 excavation revealed two rooms decorated with black and white mosaics, of which one, almost completely exposed, presented a motif identical to a mosaic in the Hospitalia at Hadrian’s villa, of interlocking circles defining hexagons.

In Area 1 further excavation and geophysical investigation by means of microgravimetric survey inside the arena and in the sector between the outer ring of the amphitheater and the baths confirmed the presence of underground structures. In particular, the eastward expansion of Saggio A has ascertained that two parallel concrete walls oriented W-E partially exposed in 2014 formed the long sides of an apsidal, barrel-vaulted underground chamber. This room is connected, in the middle of the arena, with what must be the central gallery along the major axis of the amphitheater of which segments of walls have been partially excavated.

In Area 2 portions of a new room with black and white mosaic flooring decorated with an elaborate octagonal motif were uncovered. Moreover, one of the already identified rooms, in which only a small part of the black and white mosaic was preserved, has revealed that its decoration, originally thought to be exclusively of a divided scales pattern, includes a head of a gorgon. These decorations suggest that the rooms formed part of the residential quarters of the villa, given also their location with an impressive view of plain and sea.

Such features, together with continuing finds of fragmentary opus sectile elements, colored glass tesserae, and fresco fragments, although dispersed, contribute to validating the hypothesis of an extensively appointed imperial villa