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You can walk through a 102-meter frigate that served for thirty years, plus a patrol boat and a submarine — all inside Mangwon Hangang Park.
₩3,000 for adults, ₩1,000 for children. Closed Mondays. From March to October it’s open 10:00–19:00 Tuesday to Friday and until 20:00 on weekends; last entry is 30 minutes before closing.