Here is a link about Mars Hill. You can read more about it. A quote from the article is below.
Mars Hill served as the meeting place for the Areopagus Court, the highest court in Greece for civil, criminal, and religious matters. Even under Roman rule in the time of the New Testament, Mars Hill remained an important meeting place where philosophy, religion, and law were discussed.
Paul the Apostle preached a sermon at Mars Hill, also called the Areopagus.
Acts 17:16 Now while Paul waited for them at Athens, his spirit was provoked within him as he saw the city full of idols. 17 So he reasoned in the synagogue with the Jews and the devout persons, and in the marketplace every day with those who met him. 18 Some of the Epicurean and Stoic philosophers also were conversing with him. Some said, “What does this babbler want to say?”
Others said, “He seems to be advocating foreign deities,” because he preached Jesus and the resurrection.
19 They took hold of him and brought him to the Areopagus, saying, “May we know what this new teaching is, which you are speaking about? 20 For you bring certain strange things to our ears. We want to know therefore what these things mean.” 21 Now all the Athenians and the strangers living there spent their time in nothing else, but either to tell or to hear some new thing.
22 Paul stood in the middle of the Areopagus, and said, “You men of Athens, I perceive that you are very religious in all things. 23 For as I passed along and observed the objects of your worship, I also found an altar with this inscription: ‘TO AN UNKNOWN GOD.’ What therefore you worship in ignorance, I announce to you. 24 The God who made the world and all things in it, he, being Lord of heaven and earth, doesn’t dwell in temples made with hands. 25 He isn’t served by men’s hands, as though he needed anything, seeing he himself gives to all life and breath, and all things. 26 He made from one blood every nation of men to dwell on all the surface of the earth, having determined appointed seasons, and the boundaries of their dwellings, 27 that they should seek the Lord, if perhaps they might reach out for him and find him, though he is not far from each one of us. 28 ‘For in him we live, move, and have our being.’ As some of your own poets have said, ‘For we are also his offspring.’ 29 Being then the offspring of God, we ought not to think that the Divine Nature is like gold, or silver, or stone, engraved by art and design of man. 30 The times of ignorance therefore God overlooked. But now he commands that all people everywhere should repent, 31 because he has appointed a day in which he will judge the world in righteousness by the man whom he has ordained; of which he has given assurance to all men, in that he has raised him from the dead.”
32 Now when they heard of the resurrection of the dead, some mocked; but others said, “We want to hear you again concerning this.”
33 Thus Paul went out from among them. 34 But certain men joined with him and believed, among whom also was Dionysius the Areopagite, and a woman named Damaris, and others with them.
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