They are compared to North Korea but it's not a fair comparison since they threaten no one and their people are not oppressed. They are restricted, and strongly encouraged to pursue traditional tribal activities and eschew the western world. But not oppressed, despite outside claims.
The capital city's architecture is among the most bizarre and fantastic in the world and worth a visit if you can get in, which is very hard. You have to be invited to visit. Some tourism agencies can arrange this but it's not for the average traveler.