The Asclepion (Asklepion) was a temple of Asclepius, the god of healing. In this place, in Pergamum, the unhealthy could bath in the water of the sacred spring, and in their dreams Asclepius would appear to tell them how to cure their illness. Archeologists have found lots of gifts that people would make afterwards, such as small terracotta body parts, presumably representing what had been healed.

Galen:
Galen was born in Pergamum (modern-day Bergama, Turkey), the son of Nicon, a wealthy architect. His interests were eclectic - agriculture, architecture, astronomy, astrology, philosophy — until he finally concentrated on medicine.

By the age of twenty he had become a therapeutes ("attendant" or "associate") of the god Asclepius in the local temple for four years. After his father's death in 148 or 149, he left to study abroad in Smyrna, Corinth and Alexandria over a period of twelve years. When he returned to Pergamum in 157, he worked as a physician in a gladiator school for three or four years. During this time he gained much experience of trauma and wound treatment. He later regarded wounds as "windows into the body".

Galen performed many audacious operations that were not again used for almost two millennia, including brain and eye surgery. To perform cataract surgery, Galen would insert a long needle-like instrument into the eye behind the lens. He would then pull it back slightly and remove the cataract. The slightest slip could cause permanent blindness. Galen had set the standard for modern medicine in many different ways.

Resources:
Galen Image, and write up:
wikipedia

Photo's:
Dick Osseman