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.
Today the arena is abandoned and and unused.
mnli hypothesis: Today the arena is abandoned and and unused. 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.