I know people on here have spoken of (and even ridiculed) the History Channel show Ancient Aliens in the past. I recently watched a lengthy documentary that debunks many of the major claims put forward by the show. The filmmaker's religious bias shows through in the last 10 minutes of the movie, but this is the only flaw that sticks out. I highly recommend this to lovers of history:
http://www.youtube.com/watch?v=j9w-i5oZqaQ