Noseongsanseong is a stone mountain fortress on Noseongsan, designated Historic Site No. 393 of South Korea. The walls follow the ridge in the old teme style, using the mountain's shape as part of the defence.
The site is most interesting for travellers who enjoy Korean fortress walks: old stonework, wooded slopes, and views from the higher ground. It works best as a short historical outing from Nonsan rather than as a museum-style visit.