I've been looking for modern uses of ancient amphitheatres. I know some are still being used, but I was wondering if some are used for conferences or marriages or the like?
And I was also wondering, who owns those building these days?
And perhaps the wrong subreddit for this, but: aren't there some safety concerns with 2000 year old buildings? Exposed to the elements, wars, sometimes half crumbling down. I can see they are still being used, so I guess it's okay, I am just wondering if the buildings themselves were built so strong they can still be used without any reinforcement.
A number of ancient Roman amphitheaters are still in use today. Ephesus, Halicarnassus (Bodrum) and Side amphitheaters located in Turkey, The Arles Amphitheater and Lyon amphitheater located in France are a few examples I can name which are regularly used for concerts.
Even though these amphitheaters are ancient, they survived intact to this day and are kept in good repair. The Hellenistic and Roman amphitheaters are UNESCO world heritage sites and maintained by the governments of the countries they are located in.
As for the durability and the strength of the structures, the experts of ancient architecture would be the ones to answer in detail.
I don't know much about Roman and Greek architecture in general, however, I am familiar with an Amphitheater in Caesarea (which is in present day Israel). The link I sent has pictures of it set up for an event like a concert and it's pretty cool. You asked about who owns them today, well I honestly can't speak for all of these structures since they are spread throughout many countries, but this particular Amphitheater is actually part of the Caesarea Maritima national park. Hope this helped