Originally a Hittite settlement (c. 1200 BC), it later became a Greek and then a Roman city. 

Highlights include the Roman-Greek theatre (≈15,000 seats), stadium (~12,000 seats), baths, agora, majestic colonnaded streets, city walls, gates, and fountains (nymphaeums). 

Summer (Apr–Oct): ~08:00–19:00; Winter (Nov–Mar): ~08:30–17:30; open daily. 

Yes, but it’s free if you have the Museum Pass Türkiye.