During the T.A.V. work for the construction of the Roma-Napoli train line, a large architectural complex was discovered on a hill facing the river Sacco in the territory belonging to ancient Signia. The complex is articulated in two terraces occupied by rooms, fountains and a monumental bath installation. The most ancient occupation of the site dates to the mid-Republican period, as testified by the black glaze pottery. Miniature vases, clearly of votive significance, help confirm a sacred function to the area. The earliest archaeological remains found are attributable to the second half of the second century BC and include above all a series pavements including mosaics and signinum. Important interventions of restructuring which enlarged the plan of the site date to the early Imperial period. The absence of material after the first century AD suggests a premature abandonment of the installation, despite scattered pavements made in tile above the strata of the abandoned complex which testify to forms of later reoccupation of the building. Four tombs without furnishings discovered on the inside of a few rooms of the baths could belong to this reoccupation. The installation seems to have focused on the local springs. It is hypothetically identified with Sacriportus, known from the sources, in the territory of Segni, theater of the final encounter between Sulla and Marius in 82 BC (Appian., B.C., I, X, 87; Vell., II, 26; Flor., II, 9, 24; Plut., Sulla, 28, 4).