What is your stance on the Illuminati symbolism that is ever-present in American culture?

The Pentagon, the All-Seeing Eye of Horus, various statue heights, the Bohemian Grove, etc. Why are they there? What is your take on them? I'd like opinions from all people. Taken in the Christian context that Satan is the true ruler of this earth, it makes a whole lot of sense, and I'm not one bit surprised at any of it, but I'd like other opinions from both Christians and non-Christians.