Here's the Polo Grounds as you've (maybe) never seen it - CBSSports.com
1962-04-11 The NY Mets first game played at the Polo Grounds in New York
Polo Grounds, the Mets first home from 1962-1963
Exterior of the Polo Grounds with Harlem River Speedway in foreground, circa 1915. Note vacant lot, site of Manhattan Field.
Cool 1960's aerial shot of the old Polo Grounds in Harlem
Night Baseball at the Polo Grounds
Polo Grounds - Former Home of New York Giants
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.
Casey Stengel after the last game of the season at the Polo Grounds. September 18, 1963
Willie Mays - NY Giants "The Catch" at the Polo Grounds