The works for the construction of the new dining hall of the Barracks of the Cuirassiers along via XX Settembre, brought to light some ancient structures that included a tract of the Servian Walls, a large podium and a nymphaeum (monumental fountain). The nymphaeum was most probably part of the house of Flavius Sabinus, brother of emperor Vespasian (69-79 AD) and consists of a large wall covered by a mosaic with mythological scenes and a wide apsis in its upper part, also decorated with a mosaic. Pipes placed in the upper part of the nymphaeum indicate that a thin veil of water must have flown over the mosaic producing a very suggestive effect. The podium found next to the nymphaeum can be referred to the temple of the Gens Flavia, built by emperor Domitian (81-96 AD) and dedicated to his deified family.