Castelfidardo (Marchigiano: Castello) is a town and comune in the province of Ancona
, in the Marche
region of central-eastern Italy
It is particularly remembered for the Italian victory over a "volunteer" army defending the Papal States, on September 18, 1860. The town's Museum of the Risorgimento
, in the palazzo Mordini, commemorates the battle and places it in the wider context of the Risorgimento as a whole. It houses artefacts and documents of the period, including around 130 loans from private collections or other museums.
Castelfidardo is also known as the international capital of accordion builders. A variety of other musical instruments besides the accordion have been produced in the town since the 19th century, such as the armonica.