Walking from the level ground around the Donuimun site into Haengchon-dong, you gain elevation quickly over a short horizontal distance. The city wall followed this terrain toward Inwangsan, while houses occupied narrow parcels and small valleys below it. This is why two points that look close on a flat map may actually be separated by long stairways and demanding slopes.
The wall was military infrastructure and an urban boundary regulating movement and administration
Inside were palaces, government offices, markets, and residences, while gates managed the movement of people and goods. Yet settlements, roads, graves, and farmland also existed beyond the wall. The simple opposition of “city inside, empty mountain outside” fails to represent the complexity of actual life.
Modern housing climbed close to the wall
As Seoul's population increased during the colonial era and especially after liberation and the Korean War, houses filled small hillside plots along steep lanes. Carrying water, fuel, building materials, and later installing drainage demanded additional labor. Tourism may market the site as a hill with a view, but that language should not conceal the mobility burdens residents faced every day.
The wall trail is cultural heritage and a mountain path before it is a scenic promenade
Do not climb on stones or sit atop the wall. Use site interpretation to distinguish reconstructed sections from original masonry. Stairs can become dangerous in rain, snow, extreme heat, or after sunset. Follow detours around closed areas and never turn residential alleys into group shortcuts.