Virginia's iron furnaces burned an acre of forest a day for just five tons of metal; today, 10 stone ruins hide across 1.8 million forested acres

If you've ever hiked a quiet trail in a US national forest and stumbled on a strange stone pyramid buried in the trees, you've probably found an old iron furnace. The 2008 study, ‘Legacy of Charcoaling in a Western Highland Rim Forest in Tennessee,’ published in The American Midland Naturalist, led by Justin L.

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