At its heart is the grand sloping fan-shaped Piazza del Campo, site of the old Roman forum and arena of the town's world-famous annual Palio horse race.
The forum is the largest preserved Roman forum.
mnli hypothesis: The forum is the largest preserved Roman forum. premise: At its heart is the grand sloping fan-shaped Piazza del Campo, site of the old Roman forum and arena of the town's world-famous annual Palio horse race.