From North...

Old brick(burned one) structure
 - I could identify quite many of old structure with this type of bricks

Tukul in Malakal
- The steel pole is used for roof structure which I never saw in Juba
- I could see many Tukuls with brick walls in town 

In Malakal town, I found their uniqueness from the building structure and materials which I don't see in Juba.
The local people told me that those materials come from North, of course...