The transition from the primitive communal system, whentalk about the existence of any significant public institutions, there was no sense, to primary civilizations, has become a real breakthrough in the development of mankind. Unfortunately, dating this point is rather difficult, and first of all, in connection with the fact that the history of world civilizations does not have any common temporal classification for them.

Such highly developed states as the AncientEgypt, Mesopotamia, Ancient Greece, Japan, Babylon, or the civilizations of the Aztecs, Maya and Incas existed not only often apart from each other, but also in different periods of time. This greatly hampers, in the opinion of scientists, the ability to somehow systematize the characteristics of ancient civilizations, as well as to trace their detailed history.

To date, historians tend tothe need for separate study of certain ancient peoples with the obligatory tracing of their mutual influences. But, nevertheless, it is still possible to identify some common features common to all these civilizations. Thus, the most important sign that characterizes the history of ancient civilizations is the emergence of writing. This fact is undeniably confirmed by historical documents, architectural monuments and folk legends. With the advent of the letter, the system of transferring knowledge from one generation to another was simplified and, consequently, the history of world civilizations began to be formed.

But it should be noted that not allancient peoples immediately acquired a written language, and yet their history has survived to the present day. The most striking example of this is the ancient city of Troy. The Greeks learned about him from the blind Homer, who was able to hold in his memory the events of the old epochs he had heard earlier, and tell them about his fellow tribesmen. For years these events were considered nothing more than a myth, a beautiful fiction, and scientists were skeptical about the possibility of Troy's existence in reality. But in 1873 the world was presented with undeniable evidence of the existence of this legendary city - a German businessman and a Russian merchant named Heinrich Schliemann was able to unearth the walls described by Homer. And with them he found a considerable amount of gold jewelry belonging to the people of Troy.

From this moment the history of ancient civilizations has becomethe subject of more than a close study of historians and archaeologists around the world, the intensity of excavation in Turkey, Egypt and Greece has increased. The data collected during these studies brought science much more questions than answers. The found evidence of the unusually high development of some civilizations put classical science at a dead end. Explain the existence of the eternal lamps of the ancient Egyptian priests and pharaohs, to understand how from the pyramids models of aircraft, amazingly reminiscent of modern aircraft, to explain the exact astronomical observations of the Maya and the Aztecs on the basis of our knowledge is very difficult. That is why the history of world civilizations is still full of mysteries, over which, perhaps, will be beaten by more than one generation of scientists, seeking to find the truth. After all, not all historical monuments are found, and not all written sources are deciphered, but interest in them is not quenched.

Answers to questions about the authors of the ancient pyramids,the Mayan calendar, the origins of the Greek gods have not yet been found. The number of hypotheses is growing year by year, many skeptical about traditional science talk about the interference of extraterrestrial intelligence in the activities of our ancestors, which means that the history of world civilizations will still bring us many surprises.

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