Bukhansanseong is a historic fortress located in Bukhansan National Park, South Korea. Built during the late 14th century, it was designed to protect the capital, Hanyang (now Seoul), from invasions. The fortress features stone walls, watchtowers, and various gates, showcasing traditional Korean military architecture. The fortress spans approximately 3.5 kilometers and is situated at an elevation of around 600 meters. Visitors can explore its scenic trails and enjoy panoramic views of the surrounding mountains and city. Bukhansanseong is a popular destination for hikers and history enthusiasts alike, reflecting Korea's rich cultural heritage.