This is a scattered, cumulative account of my travels, by decade, by state, province and country, in rough order of first visits to each. Subsequent visits are not recorded.
1950s
Ohio, Pennsylvania
1960s
West Virginia
(Baseball: Cleveland Municipal Stadium)
1970s
Michigan; Maryland; Washington, D.C.;Ontario, Canada; Kentucky; Tennessee; Georgia; Florida; South Carolina; North Carolina; Louisiana; New York; Massachusetts; New Hampshire; Connecticut; Rhode Island; Vermont; New Jersey; Delaware; Maine; Wisconsin; Illinois; Iowa; Missouri; Kansas
(Baseball: Fenway Park, Milwaukee County Stadium)
1980s
Nebraska, Colorado, Indiana, Oklahoma, New Mexico, South Dakota, Minnesota, Texas, Utah, Washington, Oregon, Idaho, Wyoming, Montana, and British Columbia, Canada
(Baseball: Wrigley Field, The Kingdome)
1990s
Alaska, California, Nevada, Arizona, Hawaii
(Baseball: Candlestick Park, Oakland Coliseum, The Big A/Edison Field, Jacobs/Progressive Field)
2000s
Quebec and Alberta, Canada; Tijuana, Mexico; Singapore; Bali, Indonesia
(Baseball: Yankee Stadium, Skydome, Shea Stadium, Busch Stadium, AT&T Park)
2010s
Shanghai, China; Paris, France; Puerto Vallarta, Mexico; Arkansas
(Baseball: Kauffman Stadium, Citizens Bank Park, Citi Field, new Yankee Stadium, PNC Park, Comerica Park)
2020s
(Baseball: T-Mobile Park)