Viljandi Castle is a historic fortress located in Viljandi, Estonia. Built in the 13th century by the Teutonic Knights, it served as a strategic military stronghold. The castle was an important center for trade and governance in the region until its decline in the 17th century. Today, the ruins of Viljandi Castle are a popular tourist attraction, offering stunning views of the surrounding landscape. The site hosts various cultural events and festivals, making it a vibrant part of the local community. Visitors can explore the remnants of the castle and learn about its rich history.