>> It's seen attacks by Mongol invaders and was once occupied by medieval European Crusaders. This Syrian castle, thought to be constructed in the 11th century, seeing more strife even today. As US backed militias took control of it Friday from Islamic State, a move they are calling a significant advance against the jihadists.
The castle, known as Jaabar Citadel, lies in Syria's Raqqa province, the de facto capital of Islamic State's imposed caliphate and one of their last strongholds. It's located near a dam on the Euphrates river. Islamic state took Raqa in 2013, in the chaos of the country's civil war. Now the powerful coalition of rebel groups known as Syrian Democratic Forces have laid siege to it with US airstrikes.
News of Jaabar's fall came as a delicate cease-fire between rebels and the Syrian government persisted across parts of the country, although it's failed in areas including the Damascus suburbs, brokered by Russia and Turkey. The cease-fire does not include Islamic State or other jihadist groups.