 Only three gates of the old medieval walls remain, of which two are original – the Porta di Castello, and the Porta Talassese which faces towards the sea.From here, going down towards Codaccio, is the Porta dell’Orologio, built in 1851 to replace the Porta di Mezzo.Arcidosso has several medieval churches, most notably the church of the "Madonna dell'Incoronata", where pilgrims journeyed to pray for the end of the great plague; the church of "San Niccolò", patron saint of Arcidosso, and the church of "San Leonardo".