Turku Castle, located in Turku, Finland, is a medieval fortress that dates back to the late 13th century. It served as a bastion and administrative center in the region until the early 19th century. With its iconic appearance on the banks of the Aura River, the castle has witnessed power struggles and sieges throughout history. Today, it stands as one of Finland's most visited museums, offering a glimpse into the country's rich historical past.