Welcome to Namhansanseong Provincial Park
Your first stop should be Namhansanseong Emergency Palace, the beautifully reconstructed complex of the king's quarters, which also has a hiking map of the complex.
The most popular hiking route is the two-hour loop that leads you past the main gates of Bukum (North Fortress), Seomun (West), Nammun (South) and South Command Post, with sweeping panoramas. Or you can trek the entire wall's perimeter in around seven hours. Be sure to mix up trails that lead in and out of the wall to change your views.
To get here, take subway line 8 to Sanseong, then get a taxi or take bus 9 from Exit 2 of the station to the park’s south gate, a total journey of around one hour from central Seoul.