I think there is archeological evidence that someone left something here, a long long time ago, prior to one of the previous destructions of the earth, as described in Mayan calendar cycles
Check out Puma Punku, just one of many otherwise inexplicable mysteries, but maybe the granddaddy of them all
Could be, like my dad likes to say, someone is jacking us around - or someone is pulling your lariat ... I remember reading a National Geographic mag. where some archeologist found a stainless steel tool at a dig in Russia proving that the ancients knew how to make stainless steel ... supposedly the dig was never worked before ...