The Citadel of Aleppo is a very important symbol for the people in Aleppo.
The Citadel of Aleppo is a large medieval fortified palace in the centre of the old city of Aleppo, northern Syria.
It is considered to be one of the oldest and largest castles in the world. Usage of the Citadel hill dates back at least to the middle of the 3rd millennium BC when a temple to the ancient Storm God Hadad stood there. The first use of the hill as a fortification, in the form of a Macedonian acropolis, was probably during the reign of Seleucus I Nicator in the 4-3th century BC.
It was occupied by many civilizations over time – including the Armenians, Greeks, Byzantines, Ayyubids, Mamluks and Ottomans  – the majority of the construction as it stands today is thought to originate from the Ayyubid period.
From the inside, it appears as an integrated city of buildings, churches, mosques, defense halls, warehouses, and a theater.
Also, the citadel of aleppo image is used as a logo in so many institutions in Aleppo, such as the University of Aleppo.