Namhansanseong Provincial Park is a very popular mountain-climbing and driving destination located just outside Seoul. The mountain is famous for being very beautiful all throughout the year. In the spring, the acacia trees grow thick, in the summer the green forest covers the entire mountain, and in the fall, many people visit to climb the mountain covered in red autumn leaves.Namhansanseong Fortress (남한산성), located on Namhansan Mountain, was originally built as a earthen fortress during Gogureyo period, about 2,000 years ago, but after many renovations, Gwanghaegun of the Joseon Period built the fortress properly in 1621. If you climb to the highest peak Iljangsan, you can see Incheon’s Nakjo area, and not only Seoul, but the surrounding Gyeonggi-do area as well. In terms of fortress structure, because the surrounding mountain area is high and rough, and the fortress center level and low, it is an easy place to defend, and to reside comfortably, two prime conditions for a mountain fortress.