The Koriyama Castle Ruins are located in Koriyama City, Fukushima Prefecture, Japan. Originally built in the early 17th century, the castle served as a strategic military site during the Edo period. Today, only remnants of the stone walls and moats remain, offering a glimpse into its historical significance. Visitors can explore the surrounding park, which features walking paths and cherry blossom trees, making it a popular spot for picnics and leisure activities. The ruins are also a designated Historic Site of Japan, attracting history enthusiasts and tourists interested in Japan's feudal past.