Karatepe is an ancient Hittite city with a castle that's now an open-air museum. Allow several hours to see it all. While in the area, also visit the fortress of Kozan, Kadirli Castle (where the Istanbul Museum's statue of Hadrian comes from) and other Crusades/Hittite castles and ruins. It's possible to spend several days in this area, but most people see it on a long day trip from Adana. 50 mi/80 km northeast of Adana.