The great theatre of Ephesus is impressive, but it would not have been around when Paul was here.
A Roman prison was located on the top of this hill. We don’t have record of Paul being imprisoned there but some tradition and maps indicate it as “the prison of the Apostle Paul”.
Paul taught for a good length of time in Ephesus, over two years. Excavation of the site has not been completed, but here you can see where they believe the hall to be.
Paul entered the synagogue and spoke boldly there for three months, arguing persuasively about the kingdom of God. But some of them became obstinate; they refused to believe and publicly maligned the Way. So Paul left them. He took the disciples with him and had discussions daily in the lecture hall of Tyrannus. This went on for two years, so that all the Jews and Greeks who lived in the province of Asia heard the word of the Lord.