I visited this site few days ago. It's not so difficult to reach if you're traveling by car. Few kilometers from the main road and you are there. The significance of this place is great for Roman history, Galerius, Caesar at the time when Diocletian was August. Place can be very quick visit. They are still working on the excavation, with support from the German government. An interesting fact is that the Galerius was one of the biggest opponents of the Christians, and continued their fierce persecution and murder after the death of Diocletian. Admission is 200 dinars (less than 2e).