The Kajaani Art Museum at Linnankatu 14 holds a collection of Finnish art with an emphasis on work connected to the Kainuu region. The permanent collection includes paintings and graphic work from the 19th and 20th centuries, alongside rotating temporary exhibitions that bring in contemporary work from elsewhere in Finland. The scale is appropriate to a town of Kajaani's size — not overwhelming, but with enough range to reward an hour's attention.
The building itself is worth noting: it occupies a converted historic structure close to the river. For visitors who have spent time outdoors at the castle ruins or along the waterfront, the museum provides a different angle on the same landscape. Contact the museum at +358 6155 415 (fax +358 6155 461) to check current exhibition schedules. Admission is modest and the staff are generally helpful if you want context on specific works.