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Stephanie A. Terry · CC BY-SA 4.0
Landmark Americas archaeological

Great Serpent Mound

300 BCE – 1070 CE · 1,370 years

Largest serpent effigy mound in the world in Ohio, a 411-meter earthwork aligned to solstice sunsets and lunar cycles

Wikipedia

The opening of the article, and a way into the rest of it without leaving the site.

Serpent Mound on Wikipedia.

Elsewhere in Americas at the time

Records whose own span overlaps this one, found by the same test the canvas draws with. The bar under each card is where it sits inside this one.

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Image credits5 pictures from Wikimedia Commons