the great wall of china (23 h 11 m, 30 agos 770 año aC – 6 mayo 476 año)

Descripción:

A first set of walls, designed to keep Mongol nomads out of China, were built of earth and stones in wood frames during the Qin Dynasty
Some additions and modifications were made to these simple walls over the next millennium but the major construction of the "modern" walls began in the Ming Dynasty

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