The Hub

The Hub is hard to miss, given that it's at the centre of the dome and stretches up higher than even the increasingly tall buildings as one comes closer towards it. The Hub is in several ways the heart of the dome, both in placement and otherwise - the main life support systems and generators are all housed within it, as well as the most important of the dome's buildings. The government and Bifrons have offices here, storing their sensitive data and any other facilities that they consider worth the high cost of the space.

And to be honest, it's difficult to argue that it  isn't  worth it for those who do consider it necessary - the amount of security in the Hub is unparalleled throughout the rest of the dome, with patrols overlapping and rather frequent. There isn't much located there otherwise, so chances are if you don't have a job located in the area, you won't have much reason to visit.

If you look a bit too nosy, you'll probably even be escorted back to your home district.

Inspirational pictures here.