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    South Korea's Namhansanseong: Fortress, city, treasure

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South Korea's Namhansanseong: Fortress, city, treasure

Namhansanseong is a unique mountaintop fortress in South Korea, with more than 13-hundred years of history. CNN's Jonathan Mann reports.

South Korea's Namhansanseong: Fortress, city, treasure

Namhansanseong is a unique mountaintop fortress in South Korea, with more than 13-hundred years of history. CNN's Jonathan Mann reports.