Palazzo Barberini Hidden in the cellars of the rear part of the building, a Mithraeum was found during the construction work of Villa Savorgnan di Brazzà in 1936, dating probably from the second century AD. Palazzo Barberini The Palazzo Barberini () is a 17th-century palace in Rome, facing the Piazza Barberini in Rione Trevi. It houses the Galleria Nazionale d'Arte Antica. The sloping site had formerly been occupied by a garden-vineyard of the Sforza family, in which a "palazzetto" had been built in 1549. The sloping site passed from one cardinal to another during the sixteenth century, with no project fully getting
Piazza della Rotonda the fountain in the Piazza della Rotonda was authorized on September 25, together with a fountain for Piazza Colonna, and two more for Piazza Navona; the fountain for the Rotonda, completed in 1575, was of a chalice-type design, around 3.5 to 4 meters in height, and fed with the Vergine water through a terracotta conduit. Della Porta designed the fountain, and Leonardo Sormani executed it. Due to the slope of the piazza, the fountain is approached by five steps on the south side, and only two on the north. Under the pontificate of Alexander VII Chigi, projects were set afoot