Tuesday, December 14, 2021

The Great Wall of China


Actually a series of overlapping walls, it protected the northern borders of China from "barbarian" invaders; some entered anyway and founded dynasties (Yuan, Qing). Total length was around 12,000 miles. What we see today is mostly rammed earth; brick and stone portions have been salvaged for building materials. And no, it cannot be seen from the moon.

(Image courtesy Wikimedia Commons; CTTO)

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