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  30,000 BC Asian hunter-gatherers had crossed over the frozen Bering Strait to become first humans in North America.
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  ~6,000 B.C.Europe.End of land bridge between Britain and continental Europe. Britain becomes an island.
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  between 13 and 20 billions of years the big bang probably happened
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  ~10,000 B.C. South America.Those who crossed over on Bering Strait into North America had traveled as far south as Argentina by this point.
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  3,500 B.C. Wales Pentre Ifan is built.
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  ~3,200 B.C.Ireland.The Newgrange tomb is built.
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  ~1,450 B.C. Greece Earliest records of Greek, the earliest records of any European language
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  ~2,000 B.C.Egypt and Mesopotamia.First solar-lunar calendars
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  ~2,000-1,500 B.C.Scotland.The cairns, Balnuaran of Clava, were built.
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  1,260 B.C. Greece, Troy (present-day Turkey) Trojan War
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  ~4,500 B.C.Brittany (France).The megalithic structures of Carnac were built.
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  ~3,000 B.C. England The main stones of Stonehenge are put into place.
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  ~1,700 B.C. Britain Bronze introduced in Britain
