The old town of Ghat is a compact oasis settlement of mud-brick walls, shaded lanes, and palm-fringed edges. Much of it is weathered and partly ruined, but that is part of the atmosphere: this is a Sahara town that shows its age honestly.
Walk slowly and look for the small practical details - thick walls against heat, narrow passages against sun, and courtyards built for privacy. A local guide is useful both for orientation and for understanding which parts are safe or appropriate to enter.