Turku rewards visitors who plan around a handful of highlights rather than trying to see everything. Turku Castle, one of Finlands oldest and largest medieval fortresses, sits at the mouth of the Aura River and pairs naturally with a walk to Turku Cathedral, the spiritual heart of Finnish Christianity and a national landmark. History continues at Old Great Square and Market Square, the citys original civic core, while an Archipelago Cruise or River Cruise opens up the water views Turku is famous for. Together these picks balance medieval heritage, active city life, and the surrounding archipelago in an easily walkable itinerary.