Red
Alas, you have to be in Canada to watch (or watch using VPN), but Spaceman and UFO Town are two episodes of the CBC documentary series. Spaceman covers the mysterious disappearance of Granger Taylor, who disappeared over 40 years ago claiming that he was going to travel with aliens. UFO Town revisits the town where the Guardian landing was reputed to occur.
I watched the entire UFO series on showtime and the production values are the best I've ever seen in a UFO documentary and it managed to avoid most of the woo-woo, but it is clearly targeted towards people who are new to the topic.
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Red, CBC has a youtube channel with both of the documentaries. Their youtube titles for searching are:
"A mysterious VHS tape, a military bunker, and UFO sightings near Ottawa | UFO Town"
"He built a spaceship in his backyard. Then he vanished forever | CBC Docs POV"
So I think anyone can watch them
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As for Ancient Aliens... many years ago I went and downloaded the first few episodes. It was unwatchable in my opinion. Such breathless sensational rubbish that I quickly deleted them after 20 minutes. Whoa. Same with all the Ghost reality shows... youtube had pieces of many of them at one point... unwatchable nonsense... running around in the dark like kids trying to scare each other. Nutty.
A
serious mid 1990's Britsh ghost TV show called "Ghosthunters" is available, almost complete over several seasons, on various youtube channels. This is a no nonsense show very much worth watching. It will take effort to track down all the episodes, if you so wish, as they are all put up by different people, use Wikipedia to get the list of episode titles. I was able to find them all and download from youtube. They are Unmatched by anything I have yet seen on the subject.
Search youtube to get Episode 1 and see what you think. It is by far.. the best Ghost TV show I have ever found.
Ghosthunters UK - Part 1 - Legends of Roman Legionaires +2