In 2007, baseball card collectors got the Alex Rodriguez Road to 500 insert set, which ran through all Topps baseball products and chronicled every one of A-Rod's first 500 career homers, one card at a time. It was ambitious, for sure, but seemed like it might have limited interest outside of collections specifically built around Rodriguez.
Turns out that was just the tip of the iceberg for continuity inserts (meaning those that run through a series of releases). Upper Deck recently announced The Yankee Stadium Legacy set, which will kick off in next month's Upper Deck Series 1 Baseball and continue through eight more of the company's 2008 baseball sets. With the original Yankee Stadium on its way out, this set will commemorate it with cards of every game ever played there - and in case you're wondering, that means the set will total an astonishing 6,500 cards.
A record? The Guinness World Book of Records thinks so, as Upper Deck says they will certify The Yankee Stadium Legacy as the largest baseball card set ever produced - but only once all the cards are actually available. It's hard to imagine trying to complete a set that is too big for even a 5,000-card monster box, though I wouldn't be shocked if there's someone out there who's loyal enough to the Yankees and determined enough to make the attempt. Click on the press release link below for more details, including which other brands will carry cards from the set and the contest Upper Deck is sponsoring to promote it.