The nephilim?
They were built by straight sapiens. ;-D
“While man refuses to admit it, the ancient stone artifacts were not built by homo sapiens.”
Homo Sapiens emerged in what is now east Africa, Turkey and Europe between 100,000 and 400,000 years ago and Stonehenge isn’t quite so ancient. If the “ancient stone artifacts” you mentioned are to include Stonehenge then who, other than Homo Sapiens, could have built it...Neandertals?
We certainly didn’t build the ones on mars.
So aliens came all that way across the galaxy, just to cut huge blocks and stack them like a child’s toy? Instead of building skyscrapers, using electricity, using machines, using metal and glass? I don’t think so. The pyramids are the most rudimentary form of a building that ancient men could create to have an impressive tall structure. That’s why it was men, not aliens, that built them. It was a very amazing accomplishment for the Egyptians, but for an alien, it would have looked like an anthill.