High Altar: Numidian marble, onyx and alabaster altar with columns of colored porphyry designed by Stanford White. Mosaics on the altar front are of the Agnus Dei, the Lamb, a symbol of Christ, and of Sts. Peter and Paul; on the sides, symbolic representations of the four evangelists, John (eagle), Luke (ox), Matthew (man) and Mark (lion). Interior inscription is in Latin: “Thou art a vessel of election, St. Paul the Apostle.” The three gilded bronze angels above the altar are by Frederick MacMonnies of Saint-Gaudens’ studio. (photo courtesy Ann Rieck)