The Ancient Aliens guy (Giorgio A. Tsoukalos) and his crazy theories just crack me up. I LOVE watching it because you can drive an 18 wheeler of logic through the gaps in their "theories" but it's a good mental exercise to keep your B.S. detector sharp! I'd watch it more often but the show is excruciating for my wife! She can;t stand this uber-tanned psuedo intellectual know it all. I keep telling her he clearly DOES NOT know much (besides where to get a fake tan and lots of hair supplies) but hey, I sit through Project Runway so yeah she gets payback.
Anyway the real reason I watch stuff like Ancient Aliens and America Unearthed is for gaming fodder. Despite the random "It was aliens" or "built this way...becuase TEMPLARS" there is actual interesting and unusual stuff to be seen and considered in these shows.
To that end a lot of this stuff is going to wind up in Blades & Black Magic especially as fodder in Rodinia. There is a lot of interesting ancient "lost" civilization stuff that makes great setting/inspirations for gaming and I hope to seed a lot of that as living civilizations in Blades & Black Magic.
So if you have not watched this show (or similar ones) you may want to give them a spin. In the meantime here is a link to site with a cursory look at "10 mysteries" that show some advanced civilizations in out past that we do not know too much about. Hopefully you will find some inspiring stuff in there!