you can travel to NK, but you might end up like Otto Warmbier and come home a couple years later braindead. (he stole as a propaganda poster a souvenir, but brain death after a year of brutal torture seems.. extreme.)

you're also not allowed to travel without a guide.

also, given the videos I've seen taken by tourists when they've been able to sneak away from their minders, NK does not look very happy.