Yes but that was a very specific set of circumstances, such a specific set of circumstances that they built a wall around half a city. How often does that happe

Yes but that was a very specific set of circumstances, such a specific set of circumstances that they built a wall around half a city. How often does that happen? It's why it's an iconic site that people travel to look at still today. It isn't a hallmark of totalitarianism people not be allowed to leave it, although North Koreans aren't.