Good heavens, there was a russian guy who was telling also about this
all: the so named 'Dark Ages': wiped out from our history. Grecco Tartarian and Celtic, but writing it all on the 'roman' list. There are also a lot of examples in europe about this all. Under the roman ruiins people found a far higher civilisation that looked more like Minoan culture: already with bath houses, running water for drinking water, aquaducts etc. And under the churches, often were found the remains of earlier 'temples': cure resorts. But there is an unwritten law that says that you cant dig under these 'roman' remains. They want to hide the truth. There was an article about this all from the city of Dubrovnic and many other cities. Also in England, Holland, France and more.
The celts in the low lands builded roads by using timber platforms in the wedlands: they floated on the water. The romans build their roads over it later, after murdering them. The timber platforms were also used building Adamsbrid