Koka Castle is a historic Japanese castle located in Koka City, Shiga Prefecture. Built in the late 16th century, it served as a stronghold for the Koka ninja and played a significant role during the Sengoku period. The castle features unique architectural elements, including its wooden structures and strategic layout designed for defense. Today, Koka Castle is a popular tourist destination, offering visitors a glimpse into Japan's feudal past. The castle grounds include reconstructed buildings and scenic views of the surrounding landscape. It is also a site for various cultural events, celebrating the region's rich history and heritage.