I hear you but OTOH even when taking into account that they may have spread the effort to quarry, move, and finish huge stones over centuries consider the size of the economy that would be required to provide all that labor and cost. Yet that civilization left no other trace than those stones. So the Ancient Aliens (as far out as they are) do make a pretty good point. It is not likely that the effort to produce these huge structures were as costly or protracted as we assume. And they are everywhere. The Temple Mount has 100 ton stones. The place in Syria where Alexander’s guys built a Greek Temple on top of it has such massive stones. Even Stonehenge is an example.
“consider the size of the economy that would be required to provide all that labor and cost”
Sure, but we know centralized, despotic governments existed from the earliest human civilizations. There didn’t seem to be any real shortage of labor or resources for a government once the leader convinced the people that they were a living god with absolute authority. We shouldn’t assume them choosing to move around 100 ton stones would necessarily be any more rational than the Soviets or Chinese erecting giant statues of their leaders everywhere.
As for the “ancient aliens” idea, why would any intelligent species want to bother travelling light years across space just to help some primitives move big rocks around? That makes a lot less sense than why the primitives might want to go to extraordinary efforts to move big rocks around themselves!