Finnish National Board of Antiquities
Although the exact date is disputed, the castle is generally considered to have been constructed in the 13th century. In addition to its status as a military fortress and home for Swedish nobility, the castle has seen use as a prison, and is currently a museum operated by the Finnish National Board of Antiquities. The castle is one of the main tourist attractions of southern Finland, being the centerpiece of the city and a popular venue for events, including renaissance fairs.