Does each civilization have uniquely skinned buildings and units?
Yes, they do. Every building and unit will look different from other nations. Also they change appearance as the player advances through the ages. Some buildings and units will also be completely unique to a civilization with no other similar unit/building or direct counter for them. Also, each building and unit can be “damaged”, which causes burn marks and scars to appear on the unit or building. Buildings may explode as they run low on HP.