Aliens in our past

I have heard multiple theories, such as those of Erich von Daniken, saying that aliens aided past cultures in the construction of various monuments. (Egyptian/Mayan pyramids, stonehenge, etc.)

Does anyone have any proof that aliens did or didn't aid in their construction?

There's lots on this topic if you use the search. Here's one:

www.abovetopsecret.com...

Closed.