I posted some in the Jakalla thread, but here is a link to some more - the Old City of Sana'a in Yemen:http://whc.unesco.org/en/list/385/
Note that I think this site might yield other useful article, but i have not had time to browse further.
Edit: I occurs to me, that given the fluid nature of the INTERNET, it might be best to snip some stuff from that article...
Situated in a mountain valley at an altitude of 2,200 m, Sana’a has been inhabited for more than 2,500 years. In the 7th and 8th centuries the city became a major centre for the propagation of Islam. This religious and political heritage can be seen in the 103 mosques, 14 hammams and over 6,000 houses, all built before the 11th century. Sana’a’s many-storeyed tower-houses built of rammed earth (pisé) add to the beauty of the site.
This is an interesting PDF - download the "Inventory...":http://whc.unesco.org/en/activities/569/
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