Nothing is official, ever flat out admitted by the government or media, but America has no go zones in almost every large city. We just call them ghettos. A no go zone doesn't need to be officially recognized, nor does it even need to be surrounded by prison walls. It's just a place where no unarmed civilized human being would ever voluntarily go, especially alone, especially at night. In America, our no go zones are mostly Black dominated slums. In Europe, their no go zones are mostly African and Muslim dominated slums. It doesn't mean a camera crew can't visit them. It just means that the higher risk of being attacked, combined with the utter lack of any valid reason to travel through them, means most citizens, especially White citizens, stay the hell out of them.