Camp 22

Camp 22, the largest of North Korea’s concentration camps, as seen from Google Maps.
It it estimated that around 50,000 political prisoners are held within the camp.  Prisoners inside include children and entire families.
Former prisoners have spoken of (among other things) the existence of gas chambers for human experimentation, forced abortions, rape, executions, and extreme malnutrition within the camp.
Coordinates: 42°34’29”N, 129°53’3”E
(Source: Wikipedia)