Usually historians call a very approximate date: 4th millennium BC. More precisely, it is impossible to establish with the help of conventional methods.
September 22, 10532 BC. - according to the calculations of Yevgeny MENSHOV, there was a major event on the Earth (something like a global flood), which was reflected in the construction of the pyramid complex in Giza. This same event also prompted the earthlings to erect colossal structures. And after 8 thousand years, after the flood, during the reign of pharaohs of the 4th dynasty, the damaged by time and elements of the structure were restored according to the old plans. In 10490-10390 BC. built the pyramid of Cheops, according to the data of the famous contactee Edgar CASEY .
Who built the PYRAMIDS? It is possible that the same question tormented both the ancient Egyptians and their predecessors who had once resettled on these fertile lands (until the forests in the Sahara were cut down). Some researchers believe that the pyramids were built at a rapid pace by representatives of the deceased Atlantean civilization, which had colonies in Africa (Plato said that they are representatives of a civilization founded by gods descending from the sky). In favor of the Atlantean version is also the fact that the ancient Egyptians had a lot of very accurate knowledge about our world, but only in the form of axioms, ready-made, without any evidence.
They also remember about the aliens themselves: they say that they are humanoids themselves or personally without the help of people, or they directed people inexperienced in pyramid construction. Indeed, it is difficult to believe in the technological superpositions of our ancestors. But this version arose more likely because they can not explain.
In 1978, in Giza, the Japanese repeated the experience of the ancient Egyptians and by "their method" (ie, dragging stone blocks along their inclined plane) tried to build an 11-meter pyramid copy. Nothing came of it. Then many researchers settled for the ancient treatises, trying to unravel the secrets of building the pyramids.
The ancient builders, it seemed, did not hide this - the walls of the underground corridors are covered with images of thousands of slaves harnessed to carts and hand cranes. Primitive? But the murals themselves are made in places where even a faint gleam of sunlight has never penetrated. At that time, even torches could help out in such situations, but ... there is not a hint of soot on the ceilings! It is unlikely, it is almost impossible for long strokes to be illuminated by metal mirror systems (scattering of light at such distances is too great). There are two possible explanations: either the builders had another source of "pure" light like an electric bulb (that's the interference of aliens supplying earthmen with modern building machines and devices), or the ancient people perfectly possessed clairvoyance and telepathy (and therefore could feel their pictures in darkness, could carry stones through the air by joint mental efforts).
There is also a more trivial explanation: the pyramids were built by using hydraulic lifts. On this idea of ​​the author the feat is an internal section of the Cheops pyramid, where Grigoriev saw the inclined and vertical shafts characteristic of hydraulic lifts.
There is another construction option, also associated with aliens. Not so long ago, it was found in the hieroglyphic text that a certain Egyptian god taught Pharaoh Zoser to make "ARTIFICIAL STONE", and that one in 2750 BC. built the first pyramid. "Stone" is nothing more than a cement mortar consisting of 24 natural components (limestone, shell rock, etc.). Later he claimed that the stone contains only 13 components, and among them there were those that were not part of the chemical composition of the blocks, the extraction of which was carried out in the nearest quarries. And really, if you do not lay stones, and pour the solution into the wooden formwork directly on the spot, then only this way you can achieve the necessary quality of fitting the blocks among themselves (it is impossible to even insert a needle into multi-meter slots).
Suppose, and another option for construction - "REDUCING THE STONE." Relatives of the Egyptian pyramid-builders - the pyramid-builders of the American continent owned the secret of stone softening, the stones, softened with a solution on the plant extract, became pliable like plasticine, and after molding and drying they restored their strength properties completely.
The secret of the softener is still not disclosed, and therefore there is no known way to identify the stones that have been treated with this drug (there is a possibility that the "softener" is not just a chemically active liquid). The fact that the ancient Egyptians and Hispanics received knowledge from one source is now more than obvious, it is enough to study the ways of erecting pyramids, the technique of embalming mummies, etc. So why not both of them use the "softener" for construction? In the quarry, the stones are crushed, transported in bulk (both these procedures do not present difficulties), then soften and pour into the formwork. Or - as an option - blocks are molded from a plastic stone in the same way as children from plasticine do - working without formwork, but with scrapers.
However, technology could be different. At least because they built pyramids in different parts of our planet.