Lots of work being done by rebel academics and independent researchers in this area. Check out Ben on unchartedx about the real age of these ancient megalithic structures and the kind of advanced technologies needed to create them. Ben sort of chuckles at theories that include ETs but mainstream methods are enough to show that there was a worldwide society of stone builders who achieved feats we would struggle to emulate now. Look at the giant blocks used at Baalbek in Lebanon - just do a search - those stones will blow your mind.
The mainstream is addicted to a nod at Sumerians and the Egyptians (sorry China) followed by obsession about: Greeks ->Romans->Northern Europeans. It supports a supremacist ideology justifying current power politics and modern academia is built on 'taking bribes' (I refer to the funding structures of academia) to maintain this view of the origins of our civilisation.
The Younger Dryas theory put forward by the Asteroid Research Group helps to back up a hypothesis that a significant civilisation (or civilisations) was bombed into a 'stone age' by a massive asteroid strike 12,800 years ago. It is worth investigating because otherwise we are left with being told we were cave dwelling hunter gatherers for the first - maybe - 400,000 years of our time here.
Of course RV gives us a much richer story than this. So - exciting to know we are hardly at the beginning of telling a story of us that converges upon reality and truth.