Not every wall served the same purpose
Ulsan has two historic sites with very different functions. Gwanmunseong was a defensive fortress of the Silla period. Nammok Maseong was associated with horse pastures in the Joseon period. Ask what people were trying to protect or manage, and an old stone wall becomes a much richer story.
Gwanmunseong: a defensive boundary
Ulsan's official tourism directory describes the fortress as having been built in 722, during the reign of King Seongdeok, to protect Gyeongju. The listed site extends across several districts in northern Ulsan and Ulju County. Do not assume that the broad heritage address identifies a single accessible visitor entrance.
Nammok Maseong: a wall for livestock
The same directory describes Nammok Maseong in Dongbu-dong, Dong-gu, as a stone enclosure built around a Joseon-era horse pasture to prevent horses escaping. Its role reflects the everyday work of managing animals rather than military defense.
Planning a visit
The tourism directory lists Nammok Maseong at Dongbu-dong san 197-1 and Gwanmunseong across multiple areas. It does not establish which surviving sections can currently be entered, whether trails are open, or how to reach them safely. Confirm access with the local authorities before attempting a heritage walk.