Here's the Polo Grounds as you've (maybe) never seen it - CBSSports.com
This is a ticket stub from Game 1 of the 1921 World Series played between the New York Giants and the New York Yankees at the Polo Grounds. In 1921 two years before Yankee Stadium was built, the Yankees shared the Polo Grounds with the Giants.
Polo Grounds: The view from the Polo Grounds' right field bleachers. The stadium was renamed Brush Stadium in honor of then-Giants owner John Brush in 1911, but switched back to the Polo Grounds when Brush died in 1912.