The architecture of some of these caravanserais is very fine.

The cool, quiet halls, their domed roofs, embellished with delicate stone carving, and blue, white, and yellow tiles, dimly reflected in the inevitable marble tank of clear water below, are a pleasant retreat from the stifling alleys and sun-baked streets.
Talking of tanks, there seems to be no lack of water in Teheran.

I was surprised at this, for there are few countries so deficient in this essential commodity as Persia.

It is, I found, artificially supplied by "connaughts," or subterranean aqueducts flowing from mountain streams, which are practically inexhaustible.

In order to keep a straight line, shafts are dug every fifty yards or so, and the earth thrown out of the shaft forms a mound, which is not removed.