17th-century New England farmers moved a mind-staggering amount of stone to build walls – an estimated 240,000 miles of barricades, most stacked thigh-high and similarly wide.

That’s long enough to wrap Earth 10x at the equator – and is larger in volume than the Great Wall of China, Hadrian’s Wall in Britain and the Egyptian pyramids at Giza COMBINED.

https://theconversation.com/new-england-stone-walls-lie-at-the-intersection-of-history-archaeology-ecology-and-geoscience-and-deserve-a-science-of-their-own-216701
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