This article from the Architectural Review describes how for over two millennia, the inhabitants of the Yemen have built their strange tower houses out of the earth below them. The tradition continues still and seems adaptable to modern life. Though much is beginning to decay, the crafts continue.
The Architecture of Mud, a film by Caterina Borelli and Pamela Jerome, is shot in the Hadhramaut region in the south east of Yemen which well known for its mudbrick architecture. Throughout the centuries, the population has developed very sophisticated building techniques and created a unique architectural environment.