Once upon a time in the Middle Ages, there was a bishop's residence here, the Livonian Order was located here, and even a garrison of Swedish soldiers was stationed here. Today, the fortress retains the imprint of antiquity, which is why the castle has acquired the status of a museum complex these days, and a museum-reserve has been created on its territory. The museum complex includes not only the castle, but also a lot of surrounding historical buildings - there are 37 such structures in total.