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.