The third eye is not really a part of the physical body. It is part of the second body which is etheric body. Your etheric body is a body which is similar to your physical body over which it is superimposed, it has a corresponding spot in the physical body, but it is not part of it, so far the closest reference scientist discovered on psychical body is the Pineal Gland.
This documentary goes into great detail regarding the historical background of several prominent secret societies that have appeared and disappeared throughout history including the Illuminati, Freemasons, The Knights Templar, the Assassins, and the Priory of Sion. These secret brotherhoods have often been credited with, or accused of, working behind the scenes of international affairs to influence the course of human history.
Also known as the pineal gland, said to have once been a thrid eye. Some spiritualists say the third eye is responsible for fortune telling and ESP abilities. Christians condemn these activities and evolution is thus causing it to get smaller after each generation.