Mr. Beller's Neighborhood Story of the Week is my memory of the Polo Grounds. Dad took me there for the first time in 1961. There is a great picture of a 1912 relic left behind to remind us there was a ballpark there.
Few signs of the Polo Grounds remain, but there is one significant artifact. The John T. Blush Staircase built down Coogan's Bluff ~ given by the New York Giants to the City of New York.
The link below takes you a New York Times story on the staircase. The two pictures above are from that article.
The Giants Won the Pennant! The Giants Won the Pennant! The Giants Won the Pennant!