- Photo: Henrik Jansson
- At the time of the Bishop's see, the water level of the rivers Aurajoki and Vähäjoki was four metres higher. Photo: Aino von Boehm
In the 13th century, Finland's oldest ecclesiastical and temporal administrative centre – the Bishop's see – was located in Koroistenniemi. There was probably a trading site or settlement in the area even before then. Over the centuries, the headland has been used as a cemetery, a field and for pasture. It is now used for outdoor recreation and by various local religious groups as a site for ecumenical events. Stone footings are all that remain of the structures that stood on the site at the time of the Bishop's Residence.