The building stone for the getty museum is travertine—the same source as the coliseum, trevi fountain, and the colonnade of saint peter's basilica quartz—the same source as the parthenon, the piazza navona, and the mausoleum of hadrian iron—the same source as the farnese palace, the arch of titus, and the domus aurea granite—the same source as the stadium of domitian, the piazza of st. peter's, and teh santa costanza