One photography project I do found interesting is the set below commissioned by Getty Images. The photographers they hired found a loophole in their visa conditions, managed enter NK from Russia and reached Pyongyang on trains rarely used by tourists. They were able to interact more with the locals since the border guards as well as people en route have not been "coached" to speak to foreginers and the whole thing came out feeling much more genuine than these tourist flicks.
Selected pictures featured in Daily Mail: http://www.dailymail.co.uk/news/article-3210256/Fascinating-...
Photographer's Portfolio: http://www.gettyimages.co.uk/search/events/573232783?exclude...
Photographer's written account of their travel (in Chinese), plus a few candid shots that Getty refused to buy: https://www.zhihu.com/question/19972643/answer/81163727