In one of them you can find a village which is completely built on a boulder.
The settlement is densely inhabited and the buildings stand on a plateau 100 or 200 meters above the valley. Some of the houses just hang over the cliffs. The constructions are built of mud bricks and have wooden floors. Architectural heritage is overshadowed by new buildings because they are preserved better for the past two decades. Yemen is one of the oldest human civilization, yet it is the poorest Arab country.