Frauenfeld Castle is a historic fortress located in Frauenfeld, the capital of the Thurgau canton in Switzerland. Built in the 13th century, it served as a residence for the local nobility and played a significant role in the region's history. The castle features a mix of architectural styles, reflecting its long history and various renovations over the centuries. Today, Frauenfeld Castle is a popular tourist attraction and houses the Thurgau Historical Museum. Visitors can explore its well-preserved rooms, towers, and gardens, offering a glimpse into medieval life. The castle also hosts cultural events and exhibitions throughout the year.