On this day trip from seoul head to south koreas northern limit line nll and learn about ganghwa history the nll is the maritime demarcation line in the west sea between south korea and north korea on this tour stop off at the ganghwa peace observatory the closest place to north korea from where you can see north korea and the lifestyle of north koreans learn about and understand koreas divided history on this tour in addition go to the ganghwa history museum dolmen site a unesco w