There's a lot of good theories out there and some that are so out of left field even the people with the heaviest tin foil hats on would stop and say "Wait a minute". 

 

I start with the more realistic ones. Inside corruption within our Government. CIA drug running and assassinating. False flag attacks. Federal Reserve Banking history. Petro dollar, Israel's true purpose in politics. The Catholic Jesuit priesthood. MKUltra, etc.

 

What's funny is that a lot of these theories were being thrown around decades ago and they were laughed off but then documents like Operation Northwoods and some of the experiments the CIA had conducted on the public between the effects of LSD and Syphilis on our bodies and mind was troubling. And they were all supported with proof. 

 

I've heard about the Flat Earth and Hollow Earth theories. I avoid those. It's too far out for me. I've approached them in the past with major skepticism and criticism. As far as the Ancient Astronaut theories. Some of it's plausible to me and then some of it's really just bunk. But then again, I feel like that about most religions today. 

 

If I had to recommend a rabbit hole to check into. One documentary that I fully respect and it comes heavy to the forefront with sources and reasonable data. Look up "Everything is a rich man's trick". It's a good three hour long watch or listen. But it'll really pique your interest and get you to think and question a lot of things. You may even have to pause sometimes in disbelief only to do some fact checking on your own and then come back for more when you realize it's legitimate claims or data. 

---