Ancient Agora. Athens. Greece. View of the columns stumps of the Middle Stoa, the largest building in the Agora. Built in the 2nd century BC, the Stoa had a central interior Ionic colonnade wall with a Doric colonnade on each of its four exterior sides. The Agora from 600 BC onwards was the commercial and social centre of Ancient Athens. It was here that laws were written and displayed, commercial goods bought and sold, intellectual discussions were had, and the democratic spirited was born and nurtured.