Many of us remember attending games at a ball park different from the one the team we follow currently plays in.

In many ways the parks of today are far better than those, however, since we are playing games from a prior era it helps to remember, if only in our mind's eye, what the dimensions of the park were.  In some cases it matters to the history of the game.  For instance, Babe Ruth was the first player to hit a home run into (reportedly over) the center field bleachers in the Polo Grounds in 1921.  However, the configuration of the Polo Grounds was different in 1921 and the capacity was much smaller.

Andrew Clem has prepared an impressive web site with the dimensions of each of those parks that have been used in the 20th century.  If you follow this link you can see what the parks looked like in those days.