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By Takashi
This page which is based on the information from 'THE UNIVERSE(THE SKY)=SORA' is made by HONO who is one of the fellows of THE UNIVERSE(THE SKY)=SORA.
Qanat（Iran）
http://sora.ishikami.jp/image_dir/index.php?id=20130927215542
http://sora.ishikami.jp/image_dir/images/2013/20130927215542.jpg
Although it seems that such a waterway is dug deep no less than 10 m, and it is made from the mountain over 70 km?.
The source of water can't be found as well as the one in Rome?
The semicircle made with the stone is too narrow for humans to go into even with the posture of bending down.
Could humans really make it?
http://slicer93.mbsrv.net/88-1026.html