Arles, Roman and Romanesque Monuments

Arles, Roman and Romanesque Monuments is an area containing a collection of monuments in the city centre of Arles, France, that has been listed as a UNESCO World Heritage Site since 1981.

The official brief description for this as a World Heritage Site is:

Arles is a good example of the adaptation of an ancient city to medieval European civilization. It has some impressive Roman monuments, of which the earliest—the arena, the Roman theatre and the cryptoporticus—date back to the 1st century B.C. During the 4th century Arles experienced a second golden age, as attested by the baths of Constantine and the necropolis of Alyscamps.

Source: Wikipedia