porta san paolo, porta san paolo, piazza ostiense, rome, italy

porta paolo piazza ostiense rome italy aurelian walls ancient roman gate city history historic landmark defensive architecture district pyramid cestius empire fortifications military roads road ostia engineering medieval archaeological site monuments public square heritage defenses ruins strategic gateway ostiensis attractions urban archaeology italian civilization preservation transportation classical tourism sightseeing infrastructure landmarks legacy cultural antica planning gates italy preserved 3rd-century wall home museum ostian