This is just 'ancient astronaut' nonsense. If you gave modern people some incentive to move big stones around without heavy machinery they would figure out how to do it in a couple of months. It's just not hard to do, and people have been moving much larger pieces of stone during recorded history, so we know the techniques used perfectly well.
Lots of the obelisks in Rome are far larger than any prehistoric stones moved or worked, and we know how they did it and it's impressive. Impressive isn't the same as an unexplained mystery.
Lots of the obelisks in Rome are far larger than any prehistoric stones moved or worked, and we know how they did it and it's impressive. Impressive isn't the same as an unexplained mystery.