資料來源: Google Book

The seventy wonders of the ancient world :the great monuments and how they were built

How were the ancient wonders of the world built? How many people did it take to build the Great Wall of China and the Sphinx at Giza? This text seeks to answer such questions, examining these spectacular feats of engineering and celebrating the achievements of the builders who worked without the aid of modern technology.
來源: Google Book
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