Kajaani Castle is a historical fortress located in Kajaani, Finland. Built in the late 17th century, it served as a military stronghold and a center of administration. The castle was strategically positioned near the Kajaaninjoki River, which provided both defense and access to trade routes. Over the years, Kajaani Castle faced numerous attacks and was eventually destroyed in the early 18th century. Today, the ruins of the castle are a popular tourist attraction, offering visitors a glimpse into Finland's medieval history and the architectural style of the time.