if you mean the whole thing including the stands and everything, probably the New Yankees Stadium if you mean the field dimensions, i'd say the Detroit Tigers Stadium now, in the history of Baseball, the largest offical stadium would most likely be the Polo Grounds, in which dead center field was about 500 feet from home plate, lol
Rungrado May Bay Stadium
Though subject to some debate, the majority of baseball enthusiasts would state that Coors' Field (home to the Colorado Rockies) is the largest major league baseball stadium.
There are approximately 30,000 to 60,000 seats in a Major League Baseball stadium
Currently, the oldest Major League Stadium in use is Fenway Park in Boston, Massachusetts.
It depends what stadium it is and your age
The MLB baseball stadium that holds the most people currently in 2012 is the Kauffman Stadium ^-^
Dodger Stadium has over 56,000 seating capacity...The biggest Stadium in the MLB
Yankee Stadium is a place of interest for baseball fans. It hosts a major league baseball team the New York Yankees.
Professional sports teams are constantly building bigger stadiums for their fans to enjoy. Right now the biggest in Major League Baseball is Dodger Stadium in Los Angeles.