Helsinki. Katajanokka Guest Harbour Jetty north of Katajanokka. Katajanokka & Kruununhaka bit isolated from the rest of the city, Katajanokka was known in the past for its ports and jail. Today, the district is architecturally significant Jugend style. It offers sightseeing tours, and is populated by artists and journalists. It is also a political center. Katajanokka North is the quiet and highly respected Kruununhaka district, neighboring the historic center designed by Engel.