Somebody in the house has asked why not other periods. The answer is that the finer the art the shorter the lifespan, the base Neolithic constructions (4000 BC) cry out simplicity & guage. You can have Byzantine under my Crown if you pay for it & separate it from my efforts. I want my villages to be visited for fun. I fully agree to roundhouses & other simple, old & temporary construction.
The Neoliths were too daft to overlap tiles or Hay so that water did not drip inside, so they opted for giant stones.