
“Where the terrain permitted, Roman laid out their towns on a common, rectilinear pattern with the principal north-south street, called the cardus,intersecting the main east- west street, the decumanus,usually to form a main square. … Most Roman municipalities had walls, bridges over local rivers, and aqueducts to assure the water supply. The aqueduct of Segovia is the most prominent on remaining today, but portions exist in Merida and Tarragona” (27)
A Concise History of Spainby William D.Phillips and Carla R. Phillips