Dubbed as the oldest skyscraper-city in the world, or Manhattan of the desert, Town Shibam located at Hadramawt of mideast country Yemen was once the capital of the Hadramawt Kingdom. (It is somewhat disappointed that my Yemeni friends never talk about it before.)
Shibam has existed for around 2,000 years, but most of the city's houses come mainly from the 16th century and currently has about 7,000 inhabitants. The Shibam houses safeguarded under UNESCO's human cultural heritage programme are made out of mud bricks, with only about 500 tower houses currently still there, rising 5 to 9 stories high. Inside the city there is virtually no traffic due to the extremely narrow alleyways.
The following is a Youtube video tour of Shibam Town
Archnet.org hosts a photo gallery on this human heritage.
Source: Wiki & Deputy-dog