I have been to only a couple stadiums for a game.
1. Kauffman Stadium in Kansas City
2. Camden Yards in Baltimore
3. Target Field in Minnesota - added this year.

I have toured but no game yet:
1. The previous Busch Stadium in St. Louis

I have seen stadiums being built but no game yet:
1. New Busch Stadium in St. Louis
2. Bank One Ballpark in Phoenix-now Chase Stadium

I have been within eyesight of several other baseball stadiums by driving or flying past/over them but do not count them because I was not on the property.

I have also seen several Football, Basketball, Soccer, and Hockey stadiums but have never been in any of them and have only been on the property of Arrow Head stadium in Kansas City.