The ruins of the monument are hidden between two modern farmhouses, one of which, facing the via Appia, was already known to Canina as the 'Osteria dell'Acquataccio', the other hiding the ancient entrance to the sepulchre.

Opposite the church of Domine quo vadis, at the crossroads between the via Appia antica and the via Ardeatina, partially hidden by two buildings standing on its structures, stands an ancient Roman tomb, of the tumulus type on a quadrangular base, commonly identified, on the basis of epigraphic findings, with the one that T. Flavius Abascanthus, freedman of Domitian, who owned land and a bathhouse near the river Almone, had built for his wife Priscilla, who died prematurely.

The core of the monument's base, covered in opus quadratum travertinum, is still largely preserved, above which rise two cylindrical drums in opus reticulatum tuff: in the upper one opened 13 niches, in which were placed statues of Priscilla in the guise of goddesses and heroines of Greco-Roman mythology. At the centre of the upper cylinder, on an irregular square base, stands a medieval tower, commonly known as the 'Torre Petro': it is about six metres high and crudely built from various waste materials, bearing witness to the transformation of the tomb into a fortification from the 11th century onwards.

Through the basement of the farmhouse, which, as already mentioned, hides the original entrance to the tomb, one reaches the ancient corridor, covered by a barrel vault, which leads to the burial cell, currently dimly lit by the opening at the top of the medieval tower. The cell, also covered by a barrel vault, was lined, as some remains of the masonry testify, with travertine opus quadratum. On three sides there are niches for the deposition of sarcophagi: Priscilla, as the poet Stazio recalls, was embalmed and not cremated according to the funerary custom of the time.

The interior of the sepulchre has been subjected to various building interventions: until a few decades ago, the rooms were used for maturing cheese and the wooden structures used for this purpose still lean against the walls.