During the construction of the building at the former “House of Trade” (2006), ruins of the Ancient stadium of Philippopolis were discovered.
During the last renovations in the basement of the building (former "Trading House", later "Narmag") in 2006 six rows of seats (part of the cavea - the seating area) are preserved and exhibited along with the supporting structure providing the necessary grade of inclination for the sitting spectators. Such a superstructure gives reason to the believe that the eastern part of the stadium was supported by cone-shaped vaults in a joint structure built in advance. A similar one supports the seats of the Ancient Odeon. Such a supporting system – a superstructure, is a typical Roman technique.
In addition to the seats, masonry walls belonging to later historical periods, ashlar masonry and ceramic pavement are exhibited.