A model of the Campus Martius as it was in the Augustian times. on the foreground right the Ara Pacis (altar of peace) on the foreground left the Pantheon. In the middle the Horologium, in fact an Egyptian obelisk. at 23 september (Augustus' birthday)the shadow of the obelisk pointed to the Ara Pacis. In the back on the left Augustus' mausoleum
