The amphitheater at Arles dates to AD 78-80. When intact it had two complete tiers of seating and could hold 21,000 people.
In Roman times there were definite social strata. The slaves and women sat in the now vanished cheap seats. Middle status seating looked like this:
|note the carved pattern lower center. some kind of row marker.|
In the overview you can see various exits, or vomitoria. These were arranged so that patrons in the better seats never mixed with the lower orders. Each had their own exits. Here is a view showing the stone slabs that allowed exit from the upper levels:
Here is another view of the interior galleries, for once I caught the light just right.
Once you pay admission you are free to just wander about. There are lots of enigmatic little features:
Most of the amphitheater survived because it was incorporated into the city defenses in the post Roman era. It in fact became an impressive fortress. Here is one of the towers added in medieval times: