one of the things I've learned here :
the great wall of gorgan was the first defending wall of the world , built in north khorasan to caspian sea. it was even older than china great wall.
this wall has a complicated hydraulic system for pumping and distribution of water to cities over it.
Now , you can see a few pieces of wall in gorgan
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جای خوبیه
دفتر پیشخوان میرکتولی
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