Kajaani Castle Ruins are one of the most popular attractions in Kajaani.

In the centre of Kajaani, in the park along the river, stands the northernmost stone castle in the world. It was built in the 17th century on the eastern border region of the kingdom in a remote wilderness. The castle ruins is an important cultural sight protected under the Antiquities Act.

The castle ruins are a suitable destination for day trips which, together with the services provided in the surroundings, offers visitors a versatile cultural experience.

The Kajaani Castle ruins are open to visitors free of charge all year round, but there is no winter maintenance.