"It is interesting the variety of eyes that there are in the world, but much more interesting the one that is not seen"
Keep in mind that their concepts vary in different religions and / or culture, but it should be noted that all come to the same.
This arises from a mystical concept that designates that we all have a third eye, in which energy is concentrated to develop the ability to see beyond physical reality (Metaphysics). Not all of us manage to wake the third eye so easily, but it is said that we all have one, the people who say they enjoy these experiences of opening internal kingdoms, higher states of consciousness, clairvoyance are called seers or fortune tellers.
The third eye can not be seen with the naked eye, but within some religions and cultures its location varies between the forehead a little higher than between the eyebrows and the nape of the neck. it is said scientifically that what is called the third eye is the "Pineal Gland ", which in fact has been found in other species on the planet, which means that it is linked to evolution and actually exists.