قلعة حلب
The castle is located on the right bank of the Euphrates, at a site where two islands allowed the construction of a pontoon bridge which carried a trade route from Aleppo to Harran over the Euphrates. Qal'at Najm is a castle of the truncated cone type, similar to the Citadel of Aleppo and those of Hama and Homs. It lies on a mound whose slopes were covered with an ashlar glacis, remains of which are still visible at Qal'at Najm. Also like the Citadel of Aleppo, its entrance is characterized by a ramp and a massive gate with four bends. At least three, and possibly a fourth, inscription dating to Az-Zahir's reign have been found at Qal'at Najm. Inside Qal'at Najm is a palace-bath complex, consisting of four wings opening to a central courtyard with a fountain. The castle also housed a mosque with an exterior double arcade looking out over the Euphrates. This architectural feature is very rare in mosques; another example can be seen in a mosque in the Alhambra in Spain. The town that lay at the foot of the castle, and that is mentioned in historical texts, has disappeared.