The Korean Demilitarized Zone (DMZ) is the tense, razor-thin buffer between Communist North Korea and U.S.-allied South Korea. It was carved out after the 1953 armistice, and though it’s technically “demilitarized,” both sides are armed to the teeth just outside the zone. Soldiers in steel helmets patrol the barbed-wire fences, tanks and artillery line the hills, and spy planes keep a constant wat