Here is the spreadsheet I used to track culture. It is pretty good for my own thinking about the game but I admit a bit of a pain to actually use since you have to update things yourself. On the plus side, using this made me instantly realize whenever Open Borders expire. I did not add columns for things like National Parks, tourism from walls, and unique improvement tourism at flight since the game ended before any of that came into play. Sorry it took me so long to upload - long week at work. I will use this for a few more games in progress and then write up my thoughts about how much relative tourism does (and should) come from different sources.