When U.S. Vice President Kamala Harris makes an expected visit to the Demilitarized Zone (DMZ) separating the two Koreas on Thursday, she will be the latest in a long list of dignitaries - and tourists - coming to gaze into secretive North Korea.
The DMZ is a relic of the 1950-1953 Korean War, which ended in an armistice rather than a peace treaty, and despite its name, is highly fortified from coast to coast with razor wire, heavy armaments and tank traps on either side of a 4 km-wide buffer.
