What, you want links? Oy, for you I’ve got links!!
http://karakapend.files.wordpress.com/2010/07/qanats-in-the-old-world.pdf
http://www.facstaff.bucknell.edu/mvigeant/univ270_05/jake_aq/aqueducts.htm
http://users.bart.nl/~leenders/txt/qanats.html
http://www.payvand.com/news/09/aug/1245.html
http://www.eartharchitecture.org/index.php?/archives/1045-Yakhchal-Ancient-Refrigerators.html
http://en.wikipedia.org/wiki/Qanat
http://www.saudiaramcoworld.com/issue/200603/the.art.and.science.of.water.htm
http://www.waterhistory.org/histories/turpan/
There are ice cave in Idaho, where in the middle of the high dessert in August, ice is a few feet below the surface.
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