What are the dimensions of a baseball field?
The infield dimensions are standard. 90 feet between the bases, with the pitcher's mound 60 feet 6 inches from home plate.
But everything else about the size of each ballpark varies. There are guidelines (see image), but these have ranges of sizes allowed, and some ballparks don't even meet these guidelines. Some of this is because older stadiums were built before these guidelines existed, but even some newer ballparks were allowed to not quite meet the guidelines. For example, the guidelines state the centerfield fence must be at least 400’ (121.9 m) from the apex of home plate, whilst Petco Park in San Diego (opened in 2004, long after the guidelines were established) is only 396 feet to centerfield. Other ballparks (such as Wrigley Field and Fenway Park) were built well before any guidelines were established.
Historically, the most unusual field dimensions were found in the "Polo Grounds" in New York. Center Field: was very far - 483 ft, whilst Left Field was only 279 ft. and Right Field even closer at 258 ft.
"Guideline" Dimensions
Polo Grounds, New York 1880 - 1963
The cache can be found at N 51 21.(Center Field - Rob Refsnyder) W 002 20.(Deep Left Center - Masataka Yoshida)
Use data as of the cache publication date. For field data the reference I used is Wikipedia.