Most people who stumble across a $2 bill do the same thing: they tuck it away somewhere safe, half-convinced it's rare, ...

Most Americans wouldn’t recognize some of the earliest U.S. currency that the country’s citizens used (or, in many cases, avoided because it was considered worthless paper). Here’s a selection from ...

Pull any bill out of your wallet. See the dark green numbers on the top-left and top-right corners? Those are serial numbers, and some are more rare than others. If you happen to have paper money with ...