When first watching History's Ancient Aliens

 When I first watched Ancient Aliens I thought this is a little far fetched, but as i watched GAIA and more episodes and learned more I began to see how there are legitimate archeologists and scientists who have examined ruins, petroglyphs and hieroglyphs, along with histories and mythologies of ancient cultures around the world. I’m convinced that there was global cultural diffusion before Columbus and that there is some reason mainstream archeology largely covers this up with false history. What convinced me was how the same architectural details were used and same symbology, at temples often aligned to stars around the world. Furthermore, there are artifacts using same script of Sumerians and Egyptians found in south and North America. There’s ancient keltic script found in North America as well as shared linguistics with Native American tribes. There’s just a preponderance of evidence for ancient diffusion. What I’m not necessarily convinced of but what I’m open to is that there was high tech civ, but u know I think there may be something to ufos documented throughout time.