While you are at it, maybe check out water tunnels ("Qanat") [0] and windtowers ("Bâgdir") [1] as well. I especially like the subterranean aqueducts - they required highly precise slopes to both reduce sedimentation (via high enough water speeds) and erosion (via low enough water speeds) at the same time.

[0] https://en.wikipedia.org/wiki/Qanat

[1] https://en.wikipedia.org/wiki/Bâdgir

Adam Ragusea had a great video on refrigeration topic: https://www.youtube.com/watch?v=P5lu-dq7agI How people kept stuff cold before refrigerators (13:33)