Not sure where rsmath got his info...
1) Fenway Park, Boston – 1912
2) Wrigley Field, Chicago – 1914
3) Dodger Stadium, Los Angeles – 1962
where are the baseball historians?
Sydney Cricket Ground - 1882
hosted 2 MLB games... this year!!!!
mindblowing also in that it pre-dates fenway by 30 years and wrigley field by 32 years.