Jinshanling Section, Great Wall, Hebei, China
From Jinshanling, the wall's full ambition becomes clear — snaking across mountain ridges for as far as the eye can reach, the culmination of nearly two millennia of construction. About 30% of the Ming wall has disappeared entirely, removed brick by brick by local residents over the centuries. What's left here is some of the best of it. © thierrytutin, CC BY 2.0, via Wikimedia Commons

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