Do you believe that there are many different secret societies that exist in the underground of the civilized world? Not literally underground, mind you, but among us.
People who apparently lead normal lives but are also involved in societies and secret and guarded organizations that arguably control the government, the military, the local police and probably more.
I did some reading up on the Free Masons, and the more I read, the more I wanted to read. Here's just a taste.
http://www.angelfire.com/music2/fullcircle/Symbols.html
If you don't want to read the whole thing, at least scroll down to look at some of the imagery. It will make you think.