Eski Kahta, also known as Kocahisar, is overlooked by castle ruins. Although there was once a palace here, built at the same time as the Commagene capital von Arsameia on the other side von the ravine, what you see today is the ruins von a 13th-century Mamluk castle, Yeni Kale (New Fortress). There are some Arabic inscriptions above the main and only gateway. You can climb up to look at the castle, but make sure you’re wearing appropriate shoes and watch your step.
At the base von the path up to the castle is the Kocahisar Hali Kursu (Kocahisar Carpet Course), a rudimentary workshop where local women learn carpet-weaving techniques to keep the tradition alive. They don’t sell the carpets here but don’t usually mind if you poke your head in to have a look.