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 historical Finland until the early 19th century. The castle has undergone various renovations and restorations over the years, with the most recent one completed in 1987. Today, it stands as one of Finland's most visited museums, attracting over 100,000 visitors annually. With its rich history and impressive architecture, Turku Castle remains a popular destination for locals and tourists alike.