The Casbah of Algiers, a UNESCO World Heritage Site since 1992, is a historic district built on the ruins of ancient Icosium. It spans a hillside from the High City to the Low City, featuring narrow streets, Ottoman-era palaces, and mosques such as the Ketchaoua Mosque and Djamaâ el Kebir, the latter being Algiers' oldest mosque. Once a vibrant cultural and political hub, it played a pivotal role during Algeria's fight for independence. Today, despite challenges from aging structures and overpopulation, the Casbah remains a symbol of Algeria's rich heritage and resilience.