I have a list but mostly out of interest sake to put on our website. I feel as though you must spend at least 24 hours in a country. But that is really not realistic as you don’t see much and really don’t get a feel for the place at all, obviously. I challenge your one city rule a bit as we lived in Istanbul for 2.5 months but never left the city. I definitely have Turkey on my list but we are also planning on going back soon to explore more. I definitely don’t believe in just driving through them nor spending a layover that’s only a few hours, and putting them on the list.