<prompt> Translate the following text to SwahiliAt its heart is the grand sloping fan-shaped Piazza del Campo, site of the old Roman forum and arena of the towns world-famous annual Palio horse race.  <response>: Piazza del Campo, pia inajulikana kama Piazza del Campo, ni eneo la zamani la Roma na uwanja wa mbio za farasi za Palio za kila mwaka. 