FENWAY PARK IS Major League Baseball’s oldest ballpark. Even with its age-old quirks and idiosyncrasies, Fenway represents the best of baseball’s august traditions, from the red seat that marks the longest home run ever hit there (502 feet, by Ted Williams, on June 9, 1946) to its verdant wall high above left field. However, in all its unintended points of fascination, architect James McLaughlin was duly thoughtful in his design of the ballpark.