> I find it interesting how a lot of folk and religious stories about supernatural sound like memories of civilization with technology comparable to ours.

I think about this a lot. It has led me to see that level of technology doesn't always linearly increase. At times there appear to have been great regressions proceeding from times of incredible technology. An easy example for my mind are the pyramids in Egypt, or the countless and nauseatinly intricate temples of India. I feel like there have existed technologies that we haven't yet been able to detect or understand.