It's the seventh inning stretch in Chicago at Wrigley Field. Chicago Cubs fans stand as one and in one voice sing "Take Me Out to the Ball Game." It's the middle of the eighth in Boston at Fenway Park. Red Sox fans are on their feet. "Sweet Caroline" in one voice lets you know the Sox are home.

These two baseball parks are coming together in central Maine. They share similar histories, the first being that they are the first and second oldest ballparks in the majors. Fenway Park was built in 1912 and Wrigley Park in 1914; both have unique outfields. The brick outfield wall at Wrigley...