Dividing the Korean peninsula, the Korean Demilitarized Zone (DMZ) was established after the Korean War in 1953 to serve as a buffer between those loyal to the northern or southern leaderships. Stretching 160 miles (257km) and measuring on average 2.5 miles (4km) in width, the DMZ is one of the world's most heavily militarised borders. However, it isn't just a political barrier.