This funerary monument, one of the better-known and better preserved of the antiquity, is located on the east side of via Appia. It was constructed in the 1st century A.D. in honour of Cecilia Metella, daughter of Q. Cecilius Metellus Creticus. The monument is composed of a parallelepiped base, whose cement nucleus is the only part remaining, surmounted by a cylindrical body (11 m high - 29.5 m per diameter) which preserves large part of the original travertine covering where the funerary epigraph is inserted. The top of the mausoleum is decorated with a frieze of Gallic shields, swags and bucrania and adorned by a cornice. The above structure is embattled in bricks. It was constructed in 1303 when the monument was incorporated in the Castrum Caetani, the Caetani family fortress. Inside a sepulchral cone-shaped area, built in bricks, stands out as high as the rest of the monument.