Among the national treasures you'll find:

The only known photographic image of baseball's first organized team, the New York Knickerbockers, circa 1846.

Original copy of the first written rules of modern baseball.

One of the earliest known color advertising posters promoting the very first set of baseball cards, released in 1887.

Scorecard from the inaugural World Series in 1903.

Shoeless Joe Jackson's rookie-era game-used bat.

Game-worn jerseys of Ty Cobb, Dizzy Dean, Joe DiMaggio, Lou Gehrig, Lefty Grove, Willie Mays, Jackie Robinson, Babe Ruth, and Ted Williams.