There comes a time when every foreigner in Korea makes the pilgrimage to the DMZ: the most unlikely of tourist attractions.
At the end of the Korean War, both North and South Korea signed an armistice agreement, basically saying they would cease fighting. Each side moved back 2 kilometers from the front line of the war, creating a 4 kilometer buffer zone between the countries. This area was quickly fortified by each side and became the Demilitarized Zone. A long strip of land which nobody can enter.
Years later, despite there still being tension between the two countries, the DMZ has become a major tourist destination. There are gift shops, restaurants. Places to take pictures.