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. These churches contain medieval frescoes, paintings and icons. Local legend has it that Merlin, the enchanter associated with the Arthurian cycle, lived in a cave in San Lorenzo, a village between Arcidosso and neighbouring Castel del Piano.