Sialk hill
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Sialk hills, the story of 7,500-year-old ziggurat
Date back to around 6000–5500 BC, the Sialk hills were hidden by farmland until a flood did so; no one else was aware of it.
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Sialk hill; ancient treasure in Kashan
The ancient treasure, Sialk hill, is widely known as the birth place of the world's first civilization