We've all misplaced something -- car keys, wallets, a W-2 from last year.
But what about misplacing something worth millions that has incredible historical significance? Well, welcome to one of the stranger corners of the booming sports memorabilia market.
Whether it's misfortune, the tide of time or just dumb luck, some of the most prized -- ergo, valuable -- sports memorabilia items of all time aren't in halls of fame or museums. They're missing.
Here are six holy-grail-level sports memorabilia items that are lost to history -- for now -- and what they would be worth today.