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.
Wikipedia https://en.wikipedia.org/wiki/Arles,_Roman_and_Romanesque_Monuments
Address 6A Rue du Cloître, Arles 13200, France
Coordinates 43°40'35.898" N 4°37'42.521" E