#4: Visit every MLB stadium.

• Arizona Diamondbacks, Chase Field.
• Atlanta Braves, SunTrust Park.
• Baltimore Orioles, Oriole Park at Camden Yards.
• Boston Red Sox, Fenway Park.
• Chicago Cubs, Wrigley Field.
• Chicago White Sox, US Cellular Field.
• Cincinnati Reds, Great American Ball Park
• Cleveland Indians, Progressive Field.
• Colorado Rockies, Coors Field.
• Detroit Tigers, Comerica Park.
• Florida Marlins, Dolphins Stadium.
• Houston Astros, Minute Maid Park.
• Kansas City Royals, Kauffman Stadium.
• Los Angeles Angels of Anaheim, Angel Stadium of Anaheim.
• Los Angeles Dodgers, Dodger Stadium.
• Milwaukee Brewers, Miller Park.
• Minnesota Twins, Target Field.
• New York Mets, Citi Field.
• Oakland Athletics, Oakland-Alameda County Coliseum.
• Philadelphia Phillies, Citizens Bank Park.
• Pittsburgh Pirates, PNC Park.
• San Diego Padres, Petco Park.
• San Francisco Giants, AT&T Park.
• Seattle Mariners, Safeco Field.
• St. Louis Cardinals, Busch Stadium.
• Tampa Bay Rays, Tropicana Field.
• Texas Rangers, Rangers Ballpark in Arlington.
• Toronto Blue Jays, Rogers Centre.
• Washington Nationals, Nationals Park.

Now defunct stadiums in which I saw games: the Metrodrome (Minnesota Twins); Memorial Stadium (Baltimore Orioles), Turner Field (Atlanta Braves).