The majestic castle, built of gray stone, has witnessed many historical events in the life of the country. His most brilliant time this massive castle has experienced in the mid-16th century during the time of Duke Johan and his wife Catherine Jagellonica when rooms were built in the Renaissance style. However, the most visited place is a fortress prison of Eric XIV. In the church of the Castle shows a significant collection of medieval wooden sculptures in the exhibition hall and the attic of a medieval fortress - the objects of arts and crafts and utensils made of glass, porcelain and metal, vintage toys.

In front of the castle is the Historical Museum of Turku, where with the help of exhibits and models presented to the local history of the town. To the exposition of this part of the castle are also rooms decorated in styles from different epochs, and the cabinet with a collection of coins and medals. Every year, themed exhibitions dedicated to important dates and events. In the museum shop you can buy souvenirs, prints and gifts.