The oldest plans to scale of humanmade mega-structures (IMAGE)

PLOS

The oldest plans to scale of humanmade mega-structures

Caption

Landscape of Saudi Arabia where the engravings have been found.

Credit

Olivier Barge, CNRS. CC-BY 4.0 (https://creativecommons.org/licenses/by/4.0/)

Usage Restrictions

Credit must be given to the creator.

License

CC BY

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