Built around the year 1000, the castle is located in the historic village of Mombasiglio, in a panoramic area. In 1796, the Napoleonic armies, commanded by General Seurener, were housed there and today, the first floor hosts the Museo Bonaparte, which boasts the largest collection of prints, and original etchings by Giuseppe Pietro Bagetti on Napoleon's First Italian Campaign. The castle tower houses the Museum of Marbles and Stones of the Territory, and offers a magnificent view of the surrounding mountains and valleys.

April to October 2025: open Saturdays from 2 to 6 pm, Sundays and holidays from 10 am to 6 pm.
Visits for school groups are possible during the week, subject to reservation with CoopCulture (call center: +39 011 195 604 49 or via mondoviculture@coopculture.it, or directly at https://castellodimombasiglio.it).