Five New York ballparks built in baseball’s “modern” era, which began early in the 20th century — Hilltop Park (1903-12), the Polo Grounds (1911-63), Ebbets Field (1913-57), Yankee Stadium (1923-2008) and Shea Stadium (1964-2008) — seeded much of the game’s history before being torn down. You can trace that history, and even more than baseball, below.