Gongsanseong Fortress is a historic site located in South Korea, specifically in Gongju. Built during the Baekje period, it served as a military stronghold and royal palace. The fortress is known for its impressive stone walls and strategic location on a hill, providing a commanding view of the surrounding area. Today, Gongsanseong Fortress is recognized as a UNESCO World Heritage Site. Visitors can explore its ancient structures and enjoy scenic views of the Geum River. The site reflects the rich history and architectural achievements of the Baekje Kingdom, making it an important cultural landmark.