People's who seem to have had great technology, at least in terms of the ability to carve and move huge rocks, and the motivation and wherewithal to do so.
The world’s largest non-polar desert (The Sahara), is actually the widespread burial grounds of countless, mysteriously unknown, ancient ruins & civilizations, that have long since been forgotten, having been consumed and hidden by the sands of time, thousands of years ago. And here’s the thing…when I say “thousands of years ago”…that’s the part where things start to get really strange…And check this Google Earth
Some say that the "Adam's Calendar" is 75,000 years old. Based upon some of the stones that would line up with Orion's Belt setting vertically. The placement of where constellations set and rise will change over thousands of years because of what has been pegged the "wobble" of the earth, which is actually not a wobble but a smooth procession.
So I take issue with the 75,000 year idea based upon Orion only, since Orion would rise and set in the same exact location every 26,000 years (25,770 is probably more exact)