Dar Al-Hajar – is a historical monument, considered one of the symbols of Yemen. It is located in the village of Souk Al Wadi, and often referred to as the Palace of Islam. The exact date of the original construction of the castle is unknown. However, there is a perception that the first buildings appeared long before the advent of Islam. In the Middle Ages the castle was completely destroyed by the Turks, and only in the eighteenth century, partially restored.