Tsurumaru-jo is a historic castle located in Kagawa Prefecture, Japan. Originally built in the 16th century, it served as a strategic military stronghold during the Sengoku period. The castle features traditional Japanese architecture and is surrounded by beautiful gardens, making it a popular tourist destination. Today, Tsurumaru-jo is recognized as a cultural heritage site. Visitors can explore its reconstructed structures and learn about its history through informative displays. The castle offers scenic views of the surrounding area, including the nearby Seto Inland Sea, enhancing its appeal to both history enthusiasts and nature lovers.