On a quadrangular base, covered with
travertine blocks (
opus quadratum), there were in the past two superimposed cylindrical towers, built in
opus mixtum and
opus reticulatum, the upper one with 13 niches designed to house statues of the dead. The funerary cell covered by a
barrel vault is entered via a corridor, currently accessible from the basement of one of the houses that are adjacent to the monument. The cell was coated within by blocks of travertine and included three niches designed to house sarcophagi. ==History==