The Forum (agora) of ancient Philippopolis is situate at the southern foothills of the Three Hills and is a remarkable architectural complex. It consists of a vast square space (area) with dimensions approximately 100 by 112 meters, covered with well-polished marble plates and surrounded by an arcade with Corinthian pilasters. The columns are set at regular intervals of six meters and support a broad awning that covers a traffic alley (ambulatio), next to which trade premises ware arranged. Thus, the whole space closes into a square by a single imposing construction.
Archaeological research up to now has shown that this is biggest complex of its kind discovered on the territory of ancient Thrase.