geoglyph

Blythe Intaglios Geoglyphs
Blythe Intaglios, Geoglyphs of the Lower Colorado River
The Blythe Intaglios are so large they can be seen from space. However, they were only noticed by non Native Americans in the 1930.
New Age of the Cerne Abbas Giant Geoglyph
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An article in Sapiens lists the age for the Cerne Abbas Giant geoglyph in Dorset, England. The 180 foot long image is now thought to have been made between AD 700 and AD 1100 -the early medieval period. There are 30 or more chalk geoglyphs in Southern England, no word on their age.