The archaeological excavations carried out in Enrajolat Street in Tarragona, have been provided new architectonic data from the north sector of the roman circus grandstands, and its perimeter’s connection to the representational square of the Concilium Provinciae Hispaniae Citerioris. The preservation of the visorium surface and its constructive characteristics, the relationship with the extrados grandstand’s vaults, and the new evidences of the circus’ drainage systems can get us closer to knowledge of this public roman building.