Douin Citadel is one of the archaeological and military citadels which was built over a hard natural mound of 1,475m altitude. The mountainous nature of the location was exploited in the construction operation. The citadel is located along an old strategic road in the western part of Serban Mountain. The preserved parts of the citadel and its towers in particular date back to the era of Soran Emirate. Beautiful extensive gardens surround the citadel.