I’m with you about your skepticism on how some of these sites were constructed, but I don’t think there is any reason to think that aliens had anything to do with it. I think we simply underestimate the technology that was available at certain points in the ancient world.
Archaelogists seem to assume that people were as primitive as possible, until they find artifacts or documents that prove otherwise. I’m of the opinion that ancient man was just as intelligent and inventive as we are, though he had a smaller base of knowledge to draw on, and less opportunity to transmit new knowledge to others. So, I think a lot of these “anamolies” might be explained by local technologies that were either kept secret or just never had the opportunity to be transmitted and adopted on a wider scale.
For example, they’ve recently found evidence that ancients were using large, water-wheel powered band saws to cut stone blocks with precision in one location. It’s possible that this was more widespread and the mills just didn’t survive or haven’t been recognized as such since the archaeologists aren’t looking for them. Who knows what other technology the ancients had that was lost in the countless wars, razings of cities, and burnings of libraries that happened in the ancient world?
If we don’t need alien technology to make impressive stone monuments, then I figure there’s no reason to assume the ancients did either.
I don’t see any water source for a mill/bandsaw anywhere near most of these sites located on hills or barren plateaus.
Have you seen the pics of the ruins of Puma Punku in Bolivia? Of all ancient ruins, Puma Punku is the most mystifying to me. Check out this story and accompanying pics.
Note in the story that the stones are either granite or diorite which are extremely hard to cut and probably would need diamond cutting tools.
I don’t believe that you could develop the tools and the sophisticated technical knowledge of engineering without writing and a way to transmit the knowledge so you lose me there with the argument that somehow our same species was able to do all this and then completely lost the knowledge—on a worldwide basis. How and why?
I’m willing to be persuaded that civilizations 12,000 years ago had this technology and somehow we are left with only the ruins and not their tools—but I haven’t been persuaded yet. Remember that we haven’t found much of human existence on this planet back beyond 10-12,000 years.
I’m still looking for answers but I’m not sure why a visit from space by other worlders is more fantastic than the idea that Earth had insanely technological human societies that appeared full blown and then degenerated into primititive human societies.