Underground citiesIn different areas of the planet Earth periodically find ancient buildings. And if in 2009 we knew about only four underground cities, now it is said about a hundred. They are located on different continents, though most of them are located in Eurasia.
For what reason the cities, which could live up to ten thousand people at the same time built underground? According to the position of the scientific community, this was done for safety. Like a refuge in a war, only much larger. It is assumed that the underground cities were built by peoples who did not have their own armies to hide there.
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