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Re:The Hanging Gardens of Babylon by eternalban on Tuesday September 29, 2020 @11:25AM (#24628941)
Smart money would be looking into irrigation infrastructure and history of its development in Mesopotamia. They had to raise water for a "hanging" garden. That implies some sort of pump technology.
Re:The Hanging Gardens of Babylon by thaumasiotes on Tuesday September 29, 2020 @11:47AM (#24629250)
They used Archimedes screws, as noted in the article.

https://www.amazon.com/dp/0199662266/ is a very good book about the current state of research into the Hanging Gardens. As ncmncm notes, there is strong evidence that Babylon never had any such thing, but Nineveh did.

Re:The Hanging Gardens of Babylon by ncmncm on Tuesday September 29, 2020 @11:22PM (#24635389)
Nineveh, not coincidentally, apparently had the first elevated aqueducts. With arches.