By the Tammerkoski rapids, in Tampere, Finland. Picture by Kari Savolainen. www.tampereallbright.fi
Turku Castle was founded on an island on the estuary of Aurajoki River in the 1280s as the administrative castle of the Swedish Crown Turku castle is the largest surviving medieval building in Finland, and one of the largest surviving medieval castles in Scandinavia. The layout of the castle consists of the Medieval keep and Renaissance bailey. The keep consists of a square fort with two square gateway towers; the thickness of the walls at the base is some 5 m.