With its rich history, winding white-washed alleyways and enviable Mediterranean setting, the Kasbah of Algiers has been a world heritage site for 20 years but is now threatened by neglect and decay. The city within a city, crowned by a 16th-century hilltop citadel overlooking the bay and studded with Ottoman palaces, hammams, mosques and souks, has been rocked through the centuries by earthquakes, fires, floods and conflict.

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