centuriespast:A spiral stone engraving on Signal Hill in Saguaro NationalPark, Arizona, dated 550 to

centuriespast:A spiral stone engraving on Signal Hill in Saguaro NationalPark, Arizona, dated 550 to

centuriespast:

A spiral stone engraving on Signal Hill in Saguaro NationalPark, Arizona, dated 550 to 1,550 years ago.

Credit…John Cancalosi/Alamy

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Thu, 12 May 2022 01:08:16