Hachioji Castle is a historic Japanese castle located in Hachioji City, Tokyo. Built in the late 16th century, it served as a strategic military base during the Sengoku period. The castle was constructed on a mountain, providing a natural defense and a commanding view of the surrounding area. The castle complex includes several ruins, such as stone walls and moats, which reflect its original design. Although it was abandoned in the early 17th century, Hachioji Castle remains an important cultural site, attracting visitors interested in Japan's feudal history and architecture.