Rare coins and bills that haven't been released to the public are often worth a lot of money thanks to an error or specific ...

YouTube host Dan told Newsweek: "It's amazing to see this note in this condition, like it was just printed almost 250 years ago." ...

Those are serial numbers, and some are more rare than others. If you happen to have paper money with a unique or interesting serial number, it may be worth much more than face value. In fact ...