The citadel. It was erected in 1078 by the Seljuks, a Turkish people, using stone taken from the walls of the city. It has a moat, but unlike any other citadel in Syria does not lie on higher ground, but is level with the city. The citadel has been overhauled several times. I did not find it opened, so can only show shots of its outside.
A view from a pedestrian crossing of a major artery in the centre.