To the left of parish church of Santo Stefano is the baptistery dedicated to Saint John the Evangelist, dating from the second half of the 11th century. The exterior is simple and sombre, with a square bell tower and a north-facing apse. The octagonal plan has a symbolic meaning; eight is the sum of the days of the Creation and the one of the Resurrection (the day of the new alliance with God). The cloister vault, the portal with three arches (two of which are blind) and the interior, with fragments of medieval frescoes and a cycle of Baroque paintings are all worthy of note.