The first professional game at Fenway took place on April 20, 1912 (the same week the Titanic sunk), some 27,000 fans watched the Red Sox beat the New York Highlanders (later known as the Yankees) by a score of 7-6 in 11 innings.
In this day and age, when advertisements are showing up all over parks, it's a rarity to see something that used to have ads and now doesn't. But that's exactly the case with Fenway's Green Monster. The 37-foot-high left field wall was littered with ads until 1947, when it was painted green.
The numbers used to indicate runs and hits on the manual scoreboard in left field are 16 x 16 inches.
Amidst all of the green bleacher seats behind the right field bullpens lies one red seat, signifying the spot where Ted Williams' mammoth 502-foot home run landed on June 9, 1946.