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Lovers enjoy a winter walk through snow-covered Namhan Sanseong (UNESCO World Heritage)
source
"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." (source)