Why exactly does Fenway Park have the Green Monster, anyway?

What's behind the green monster at Fenway park?

Today in Baseball History: Fenway Park opens - NBC Sports

Ballpark Quirks: How Fenway Park's iconic Green Monster was born - Sports Illustrated

Going through pictures last weekend I found some old pictures of Fenway in 1989. looks a lot different now. : r/redsox

Fenway Park has come a long way over the past twenty years (Patriots' Day 1994 vs. Patriots' Day 2014) (xpost from r/redsox) : r/baseball

Ballpark Quirks: How Fenway Park's iconic Green Monster was born - Sports Illustrated

When a professional baseball field is built, does it have to comply with a specific size and structure? Are they all the same? - Quora

The origin story of Wally the Green Monster - The Athletic

Hanscom Airmen at Fenway for Red Sox Home Opener - The Bedford Citizen

Fenway to be frenzied as Red Sox seek to clinch World Series

Boston Red Sox cutout fans fill Green Monster seats; 'My eyesight, I can't tell the difference anyway,' Ron Roenicke jokes

Green Monster –

Iconic America, Fenway Park, Episode 1

The Fascinating History (& Secrets) of Fenway Park's Iconic Green Monster - FanBuzz

Green Monster - Wikipedia