The survivors had climbed the mountains in front of them from different places when they had heard the instructions from the voice.
The cities at the summit of these mountains of all four zones were quite similar to the old cities on Earth, like Athens in Greece or Damascus in Syria.
The architecture of these new cities was the same but the cities were missing one thing. Advanced technology. To be precise the technology they were familiar with was nowhere to be found in these cities at the summit.
The people there wore plain cloth, a single sheet of cloth extended from their collar bone to their heels. Their houses were like big huts. This was how behind the people of entry mountains were either it is in their sense of fashion or dressing, or their house style.
It wasn't like the survivors could complain. Just surviving through all the ordeals they faced was a blessing.