content: Maybe 300000 years ago, initially man was created by the greys, who aren't actually alien, but a synth, an AI, a robot.    They made us to mine ore for them.  God got involved and terrified the ai robots from space.  So now they are forever terrified of the "hidden hand". The high technology ruins of megalithic type where massive stones fit perfectly together is the remnants of the last height of civilization around 12000 years ago.  Then the earth got hit by possibly 3 different cataclysms simultaneously. The sun micro nova, asteroid impact,  worldwide flood/mudflood.  Smashed the earth back to the stoneage. At least this is what 17 years of research into this sounds like.