Fortress Wall of Seoul, in Seoul, South Korea

The Fortress Wall of Seoul or Seoul City Wall surrounds the original city and runs nearly 19 kilometers around the city center. The stone borders, set along the four inner mountains of Bukhansan, Naksan, Namsan, and Inwangsan have gone through renovation efforts, though much of it remains the same. Some parts were demolished due to modernization, but it has been recognized as a national structure. Erected in the late 1300s, it had eight gates, with four main ones and four auxiliary ones. Those interested in learning more should visit the Seoul City Wall Museum which features a miniature model and a permanent exhibit about the wall. There are multiple points of entry, but we chose the paths near the Seoul City Wall Museum for this visit, due to proximity to other sites.