THis show is just BS. IF and it is a BIG IF there was some spek of truth in what the show portrays it would be lost in the pile of conjecture that the idiots, yes idiots spout.
In several episodes they state that the people depicted what they saw litterally and sometimes depicted the bloody aliens as an interpretation. The episode that really takes the top prize is the one featuring alien flying mansions with gardens related to India.
I believe that life is abundant in the universe. I don't believe that an alien race can bypass the laws of physics. I dont believe that the laws of physics can be overcome. And I don't believe that an alien race would build monuments to themselves and then just bugger off.
I am a rerptile and I claim my seventy-odd virgins on a planet in the beta centauri system. I've got as much proof as the spiky-haired geek.