Ancient Aliens is truly fascinating. Thought provoking, historical, and at times... a real giggle! I love being intrigued by everywhere they take me, and always wait for the grand ancient alien theorist postulations. Their ideas can be at times so on point it's disturbing, though others tied to the storyline by nothing more than chewing gum and a wee bit of string!
Raises some really interesting questions but has failed to capture my attention beyond a couple of episodes as I found it quite repetitive. Still worth a try if you like documentaries based on aliens and history.