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The Great Wall of Gorgan is a series of ancient defensive fortifications located near Gorgan in the Golestān Province of northeastern Iran, at the southeastern corner of the Caspian Sea. At 195 km long, the wall is second only to the Great Wall of China as the longest defensive wall in existence, but until recently, nobody knew who had built it. Theories ranged from Alexander the Great, in the 4th century BC, to the Persian king Khusrau I in the 6th century AD. Archeological evidence and scientific dating now suggest that the wall was built in the 5th or 6th century AD, by the Sassanian Empire. This makes the wall over a thousand years older than the Great Wall of China, and even more impressive is the fact that it’s more solidly built than the early forms of the Great Wall.

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