It is always free and enjoyable to have a stroll in the old towns in Finland, which consist of, as a contrast to the continental Europe, mainly wooden houses. Rauma and Porvoo (Borgå) old towns are the most known ones but even Naantali, Kristiinankaupunki, Pietarsaari (Jakobstad) and Pargas (Parainen) have lovely little old towns left. Most of the medieval wooden towns have at some point burnt so whatever is left is worth cherishing.
A quick read in Wikipedia tells me Rauma became a city in 1442 and has the biggest old town. It is also one of the World Heritage sites protected by UNESCO. Parts of Porvoo are slightly older, from the late 14th century. Both of them also have lovely little cafés and handicraft shops (not free nor cheap but full of atmosphere 😉 ) in the old buildings.
Unfortunately I don’t have any proper illustrating pictures from Naantali and Parainen (I can’t believe it as they are both close to my hometown Turku and they are therefore the ones I’ve been to most often to!) but there are few teasers below to give you a feel of the other medieval old towns in Finland.