The narrow, short street leads down from the main gate of the fortress to the "Chiesa di Sant'Agostino" with its simple 13th-century, Romanesque façade. Adjacent to the church is the former convent, now the Musei Riuniti, both a civic and diocesan museum, housing among its collections: a wooden crucifix by an unknown artist of the Sienese school, two 15th century wooden sculptures, including a "Madonna" by an anonymous artist, and several terracotta sculptures attributed to the Della Robbia school. The collection also includes a "St Peter and St Paul" by Ambrogio Lorenzetti and a "Virgin and Child" by Simone Martini. There are also modern works from the early 20th century in the museum.