DemocRATS and sheep will finish the job that aliens gave up on.
I don’t believe these structors were built by humans alone.
We’re just not that smart, then and now.
We were that smart prior to the flood, when the environment was better for us. It’s quite possible that these stone structures are remnants of the antediluvian civilization that preceded the flood.
Humans have been that smart for probably 20-30,000 years if not earlier-trade and exploration was the reason for invention-travel to a place with new people and new trade goods, new women-or even a place to take over if it was better than your place and the occupants weren’t as good with weapons as your guys-no aliens needed. People have always been as smart as we are now-if they hadn’t been, all of us Caucasians and Asians would not have Neanderthal DNA like we do-people had to travel a long way early on to spread that around...