On the subject of North Korea, in 2008 a twentysomething Austrian man spent six days in North Korea, crossing the border at a "forbidden" Russian train station, booked hotels in Pyongyang, rode around their metros, went on day-trip travel tours, and simply exited the country on a train to Beijing, and was never approached or questioned. Just acted like he belonged, apparently had no fear (or knowledge) of Camp 22, and blogged about his experience with hundreds of photos and videos:
http://vienna-pyongyang.blogspot.com/