Ancient Serpent Mounds, the mystery of the cosmos world order

Why and when, by whom ancient megalithic structures known as Serpent Mound were created in the past.
Purpose. My thoughts.
Shafts are both complex, but at the same time very simple in understanding the community of crystals, memorizing thoughts, emotions and physical phenomena from all spaces and subspaces simultaneously. Why did the people of the past call the serpentine shafts, I think they saw, with their vision, crystal power energy emissions. What miracles created a special kind of energy, look in the film.