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The section about using qanats for cooling and ice storage by the Persians around 400 BCE [1] is fascinating.

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




the last photo in the link was 10 min walk from my house. At that time (20yrs ago) they'd turned it into a ball pool for kids to play. Currently they've turned it into a Zoorkhaneh (https://en.wikipedia.org/wiki/Pahlevani_and_zoorkhaneh_ritua...). This is nostalgic!




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