I've had mixed feelings about the History channel show Ancient Aliens over the course of its run. When the original special aired a couple of years ago, I thought it was interesting and presented the information well. I'm not a believer of the ancient astronaut hypothesis it presented, but I'm open to the possibility (at least certain aspects of it). So when they decided to turn it into a series, I figured I would give it a shot. After watching a couple of episodes though, I lost interest. I thought they were just getting silly about it, seemingly assuming aliens had something to do with almost any ancient mystery. Although inspired by writers like Zecharia Sitchin and Erich von Daniken, ultimately, all they are doing is inserting science fiction concepts that have been developed primarily over the last 60-70 years into history.
But I did catch some second season episodes that sounded like they might be interesting when I didn't see anything better on. My impression of the show didn't change much, but I did realize that the information they were presenting was interesting, even if their analysis of it could be a bit silly at times. So I've decided to watch the third season just to see what they bring up. I figure whatever they bring up will be interesting, even if I don't agree with their theories.
On the other hand, I was surfing around on Youtube today and came across a video called The Mysterious Origins of Man. It was obviously pretty old since Charlton Heston was the presenter (from 1996, according to Wikpedia), so there isn't any new information in it, but I thought the information was presented well. It covers topics such as out of place artifacts, Tiahuanaco, and ancient Egypt. If you're interested check it out below.
Here is a shortened version of that video: http://youtu.be/nne_-j08yMo