서산 해미읍성 · Landmark · Chungcheong
Built as a military fortress during the early Joseon period, Haemieupseong Walled Town is considered one of the best-preserved walled towns from that era.
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There is no weekly closing day here — you can come any day of the week.
Counting foreign visitors to Seosan-si, Chungnam over twelve weeks, Sunday is the quietest day you can actually go and Saturday the busiest — a difference of about 29%. These are district-wide figures rather than a headcount at the gate, so treat them as a tendency.
Opening hours are 05:00 to 21:00. March-October / November-February 06:00-19:00. It stays open into the evening, which is usually the calmest and coolest time to come. Tour groups tend to arrive mid-morning and again after lunch; the first hour after opening is normally the quietest stretch of any day.
Entry is free. Nothing needs to be booked or queued for in advance.
Cards are accepted. Foreign Visa and Mastercard work almost everywhere in Korea, and contactless is normal.
English signage is partial — enough to find your way, not enough to explain what you are looking at. The Korean name above is worth showing to a taxi driver or a passer-by; it works better than pronouncing it.
There is no subway station close by. A taxi or an intercity bus is usually the way in — show the Korean name above to the driver.
Google Maps · Naver Map · Kakao Map
Google Maps shows public transport in Korea but not walking routes. Naver or Kakao Map gives walking directions.