I found some of these pictures a few years ago, of the Athens Olympic park as it stood in 2012, but I’m only going to put one here. You can likely Google for more pictures, but here are a couple of pictures that tell a pretty strong story by themselves.
One of the comments made in the linked article is the admission that there was poor planning for repurposing the facilities after the games, which is sad. Obviously, national economics plays a factor. It would be interesting to compare other venues – anything before last year’s London games (winter or summer) – to see how the facilities are holding up.