Fenway Park, which opened in 1912 is a unique ballpark with an interesting wall. The Green Monster is the nickname of the 37.167-foot left-field wall in the park. It is located 310 to 315 feet from home plate; this short distance often benefits right-handed hitters
Part of the original ballpark construction of 1912, the wall is made of wood but was covered in tin and concrete in 1934 when the scoreboard was added. The wall was covered in hard plastic in 1976. The scoreboard is manually updated throughout the game. Despite the name, the Green Monster was not painted green until 1947; before that, it was covered with advertisements. The Monster designation is relatively new; for most of its history it was simply called "the wall." In 2003, terrace-style seating was added on top of the wall.
"The Triangle" is a region of center field where the walls form a triangle whose far corner is 420 feet from home plate. That deep right-center point is conventionally given as the center field distance. The true center is unmarked at 390 feet from home plate to the left of "The Triangle" when viewed from home plate.
There was once a smaller "triangle" at the left end of the bleachers in center field, posted as 388 feet. The end of the bleachers form a right angle with the Green Monster and the flagpole stands within that little triangle. That is not the true power alley, but deep left-center. The true power alley distance is not posted. The foul line intersects with the Green Monster at nearly a right angle, so the power alley could be estimated at 336 feet, assuming the power alley is 22.5° away from the foul line as measured from home plate.
Pesky's Pole is the name for the pole on the right-field foul line, which stands 302 feet from home plate, the shortest outfield distance (left or right field) in Major League Baseball. Like the measurement of the left-field line at Fenway Park, this has been disputed. Aerial shots show it to be noticeably shorter than the (actual) 302-foot line in right field, and Pesky has been quoted as estimating it to be "around 295 feet".
Despite the short wall, home runs in this area are relatively rare, as the fence curves away from the foul pole sharply. The pole was named after Johnny Pesky, a light-hitting shortstop and long-time coach for the Red Sox, who hit some of his six home runs at Fenway Park around the pole but never off the pole. Pesky (playing 1942 to 1952, except for 1943 to 1945) was a contact hitter who hit just 17 home runs in his career (6 at Fenway Park). It's not known how many of these six actually landed near the pole.
The term, though it had been in use since the 1950s, became far more common when Parnell became a Red Sox broadcaster in 1965. Mark Bellhorn hit what proved to be the game-winning home run off of Julián Tavárez, in Game 1 of the 2004 World Series off that pole's screen.
On September 27, 2006, on Pesky's 87th birthday, the Red Sox organization officially dedicated the right field foul pole as Pesky's Pole with a commemorative plaque placed at its base.
In a ceremony before the Red Sox's 2005 game against the Cincinnati Reds, the pole on the left field foul line atop the Green Monster was named the Fisk Foul Pole, or Pudge's Pole, in honor of Carlton Fisk. Fisk provided one of baseball's most enduring moments in Game 6 of the 1975 World Series against the Reds. Facing Reds right-hander Pat Darcy in the 12th inning with the score tied at 6, Fisk hit a long fly ball down the left-field line. It appeared to be heading foul, but Fisk, after initially appearing unsure of whether or not to continue running to first base, famously jumped and waved his arms to the right as if to somehow direct the ball fair. It ricocheted off the foul pole, winning the game for the Red Sox and sending the series to a seventh and deciding game the next night, which Cincinnati won.
Source: en.wikipedia.org/wiki/Fenway_...