A good example is Florence, a city that grew significantly during the Middle Ages and the Renaissance, but also retains traces of its Roman past.
The old town has a rectangular plan in which the Cardo and Decumanus, which intersect in Piazza della Repubblica, still survive. The succession of orderly, parallel streets in the historic center contrasts with many other European cities that grew during the Middle Ages, where the plan tends to be much more disorderly.
Another city in which the remains of a Roman plan can be seen is Mérida. Although the composition has changed substantially, the historic center is still organized in a fairly orderly succession of streets arranged in a grid. These streets lead to places and monuments that maintain their Roman past, such as the bridge over the Guadiana, the arch of Trajan, the theater and the amphitheater.
Zaragoza also stands out in the list of cities that maintain traces of Roman urban development. The ancient Caesaraugusta located its Cardo in what today is the area of Calle Don Jaime I, and its Decumanus in the surroundings of the Calle Mayor. In this way, the streets crossed the entire city from north to south and from east to west, connecting the gates of the city.