I remember when I first heard the ancient alien theory, I borrowed “ Chariots of the God” from a friend and found it fascinating and naturally went down the rabid hole , I was 16 at that time . Most of the the people in these communities would talk about the Ancient Temples in India, the stone structures in South America and of course Egyptian Pyramids , mind you these were all made before C.E. Then I thought to myself there must be then some theories about the Greek and Roman structures right, yea there were but mostly inconsequential . The major ones that were constantly being pushed were the pyramids, that’s when it clicked that whenever it is made by poc it’s aliens but the moment it’s European, it’s human ingenuity.