 Complete the following phrase:  The main point of interest is the Romanesque abbey church of San Michele Arcangelo. While the foundations are from the 11th century, the current structure dates back to the 13th century. The church was extended and altered through several phases of construction, repair, and maintece in the Middle Ages. Today the church has a naves and two aisles, each finishing in an apse. The church was renovated in 1947 but the beautiful frescoes some probably by the school of Niccolò Alunno are in various stages of deterioration, mostly due to the damage from the 