I’m up to 20. My ranking (year(s) attended in parentheses)
1 San Diego, Petco Park (2021)
2 Boston, Fenway Park (2017, 2024)
3 Seattle, T-Mobile Park (2023)
4 Detroit, Comerica Park (2023)
5 San Francisco, Oracle Park (2012)
6 Cincinnati, Great American Ballpark (2019)
7 Atlanta, Truist Park (2018, 2019)
8 Minnesota, Target Field (2018)
9 Kansas City, Kaufman Stadium (2019)
10 Houston, Daikin Park (2000-2025)
11 St. Louis, Busch Stadium (2006)
12 New York, Citi Field (2022)
13 Los Angels, Dodger Stadium (2017)
14 Philadelphia, Citizens Bank Park (2017)
15 Washington, Nationals Park (2014)
16 New York, Yankee Stadium (2017, 2019, 2022)
17 Texas, Globe Life Field (2023)
18 Miami, LoanDepot Park (2025)
19 Arizona, Chase Field (2023)
20 Milwaukee, American Family Field (2018)
Honorable mention: Estadio Alfredo Harp Helú
Still to go:
Anaheim, Anaheim Stadium
Athletics
Toronto, Rogers Centre
Tampa Bay
Baltimore, Camden Yards
Cleveland, Progressive Field
Chicago, Guaranteed Rate Field
Chicago, Wrigley Field
Pittsburgh, PNC Park
Denver, Coors Field