The Diocesan Museum of San Sebastiano is part of one of the most picturesque corners of the city: Contrada Mondovì.

Starting from 2000, the entire block surrounding the church of San Sebastiano has undergone an intensive restoration work that led, in September 2012, to the opening of the Diocesan Museum. The museum mainly exhibits works owned by the Confraternity and through videos and animations tells the history of the city and the territory, starting from the evangelization by St. Dalmazzo (3rd century AD) up to the present day.