I must agree with many other reviewers that this would be a better site if there was more information. However even without a guide this is a very impressive and very large collection of ruins, essentially an entire town, which was reportedly one of the most beautiful cities of the Hellenistic era ca. 300 BC, but was also occupied by the Romans and then by the Seljuq Turks until it was abandoned after ca. 1100 AD.
There is a large agora and stadium, Roman baths, and the impressive remains of the towers/gates from the Hellenistic times.
There is little shade anywhere, and when we visited in late June it was scorchingly hot (I think 42C that day), and so be prepared if you're visiting on a sunny summer day.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.