What are some games you consider to be "evergreen"? They will never get old to you, no matter how many times you've played them, or how many newer games you play.
I don't think I've been seriously into the hobby long enough to have much insight into this, but I can guess that maybe some deeper abstract games might have this quality, but I don't mean to say that only abstract games are this way. For example, I know the community for Dune has lasted for decades, with some people playing it hundreds or thousands of times over the years.
I'd love to get a few of these in my collection to maximize my return on investment, lol.
What are yours?