Photo: Exact Date Pinned to Great Pyramid's Construction?



The setting sun casts a golden hue over the Pyramids of Giza in Egypt in an undated picture.

Construction of the Great Pyramid (right), the tomb of the pharaoh Khufu, started on August 23, 2470 B.C., according to controversial new research announced in August 2009.

Photograph by Kenneth Garrett/NGS


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