The “Ponari” nymphaeum, named after the owner, a member of a rich family, was a place of Cassino, consecrated to the nymphs, that housed water features for a rich private residence. It is composed of two rooms: a rectangular room with a barrel vault and rectangular niches along the walls and a small atrium in front with a shallow pool at the centre (impluvium).
Originally, this nymphaeum of the first century. B.C. had walls covered by a mosaic decoration, with incrustation of glass paste, lapis lazuli and seashells. The building was successively restored, and the decorations were made in painted plaster with geometric patterns, with multi-coloured imitation marble.
It was used as a refuge during World War II.