We have some, but few, written accounts of these cultures before this time period, but earthworks like the great serpent mound have been sources of speculation for centuries.

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The seven main hills of Amman spread out below like a rumpled carpet, each mound helping to define a different neighbourhood within the city.

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"Being so early, I don't feel like I've had enough mound time for it to just click, and not really think about it, " Strasburg said.

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