Wow…what a question for me!
I’ve been to Iceland (but only to change planes), The Netherlands, Republic of Ireland, Scotland, England, Belgium, Luxembourg, Germany and Canada. I do want to return to most of these places but hope to see more new places before returning to these.
With 195 recognized countries in the world, I think it would be easier to just say I want to visit pretty much most every country but with a few exceptions. I do have a few that are popping up in potential trip ideas, but nothing definite.