From the Wikipedia (by the way: I contributed heavily, financially, over many years. Did you?): "Sanctuary of Asclepius
Three kilometres (1.9 miles) south of the Acropolis at (39° 7′ 9″ N, 27° 9′ 56″ E), down in the valley, there was the Sanctuary of Asclepius (also known as the Asclepium), the god of healing. The Asclepium was approached along an 820-meter colonnaded sacred way. In this place people with health problems could bathe in the water of the sacred spring, and in the patients' dreams Asclepius would appear in a vision to tell them how to cure their illness. Archeology has found lots of gifts and dedications that people would make afterwards, such as small terracotta body parts, no doubt representing what had been healed. Galen, the most famous doctor in the ancient Roman Empire and personal physician of Emperor Marcus Aurelius, worked in the Asclepium for many years. Notable extant structures in the Asclepium include: the Roman theater; the North Stoa; the South Stoa; the Temple of Asclepius; a circular treatment center (sometimes known as the Temple of Telesphorus); a healing spring; an underground passageway; a library; the Via Tecta (or the Sacred Way, which is a colonnaded street leading to the sanctuary) and a propylon"