Scores of soldiers march through a zone sealed off by green mesh fencing and checkpoints. A crew of about 1,000 soldiers and 2,000 police officers works around the clock, along with thousands more civilians in street clothes and hard hats, spurred on by billboards that rate their performance.

But they are not building tanks here at the foot of Mansu Hill, or weapons, except perhaps for a propaganda war. They are building 3,000 new apartments, a department store, schools and a theater, in the hope of selling a modern version of Pyongyang to the people of North Korea albeit one that most will never get to see.