Ironically the sad sight of a pointlessly divided nation remains a highlight of any trip to North Korea. Even if you're just in North Korea for a couple of days, you'll be taken here as the DPRK is very keen to show off what it considers the net result of American imperialism.
While military history buffs will be in their element, you don't have to be an expert to appreciate the weirdness of the site where the bloody Korean War ended in an unhappy truce. Seeing the situation from the North, facing off against US troops to the south is a unique chance to witness things from a new perspective.
Among the stops on your DMZ tour is the Armistice Talks Hall where the negotiations were held and the truce eventually signed on 27th July 1953.