Von Daniken, who wrote one of the more influential books on the topic, has been debunked several times. He's a media whore. Also, I've seen the Ancient Aliens shows they put on the (pseudo)History Channel and National Geographic...the people they interview have also been debunked (and some of them are fairly delusional). The evidence only holds up as long as you don't do any digging beyond what the show promotes.
I personally hate this theory because I feel it's insulting to the human race to assume we were not capable of the ingenuity it would require to build the structures these numbnuts say aliens must have done. The capability to reason, the inspiration for invention, and the propensity for logic didn't suddenly just appear after ancient times.
I personally hate this theory because I feel it's insulting to the human race to assume we were not capable of the ingenuity it would require to build the structures these numbnuts say aliens must have done. The capability to reason, the inspiration for invention, and the propensity for logic didn't suddenly just appear after ancient times.