The site of Ad Medias (Mesa di Pontinia) is one of three minor centers in the Pontine region being investigated by the GIA since 2012. Aim of these investigations is to establish the size and functions of such sites as well as their development over time.

In October 2012, gridded field surveys (25 × 25 m grids) were undertaken south and east of the Casale di Mesa (the presumed core of the ancient site) and on the opposite side of the via Appia. These prospections showed that the site did not extend in the former area. Directly across the via Appia (and the Decennovium Canal), the field surveys recorded two related activity areas: one contains artifacts dating between the 3rd century BC and the 2nd century AD and includes evidence for iron smelting (possibly a smithy). The other mainly consists of Republican ceramics and building debris, but also contains Medieval ceramics. At a larger distance from Ad Medias, the surveys mapped a series of small isolated artifact concentrations of Republican (3rd – 1st century BC) date, which probably represent small farmsteads.

In August 2012 and Spring 2013 the field surveys were followed by geophysical prospections in a more restricted area. Using a fluxgate gradiometer we investigated a transect across a field south of the Casale di Mesa on the opposite side of the Via Appia. The data showed several linear anomalies (subrecent drainage ditches, a track way), as well as an anomaly that corresponds to one of the aforementioned activity areas; perhaps there are some linear anomalies (wall remains) in this area as well.

In Spring 2013 magnetometry was applied to the fields directly north and northwest of the Casale di Mesa. These investigations, carried out by Eastern Atlas Prospections, yielded several ancient structures: first of all, a large two-room building directly north of the large Roman mausoleum that is preserved on the site. Also, two small rectangular structures (possibly Roman burial monuments) were identified along the via Appia west of this mausoleum and south of the Casale di Mesa. In addition, several linear anomalies with north-south and east-west orientation were identified. These anomalies may represent ditches that relate to a centuriation system that has previously been identified in the area