Today, they tend to be very rare and valuable. You might be surprised to learn that 100-dollar bills are the most common currency in circulation today. The Federal Reserve estimates that there are ...

It's handy to have a quick reference chart to help you see at a glance which fives are worth the most. The value of 5-dollar ...

but some rare 10-dollar bills can be worth a fortune (or at least as much as a small house). Learning to spot the most valuable 10-dollar bills means knowing what makes them worth so much.

In contrast, the most valuable coins can command $3 million or more. If you have a rare $1 bill, you can only expect it to fetch a few thousand dollars. Explore More: 10 Rare Coins Expected To ...

How would you like to make $150,000 simply because you checked your wallet or the pockets of your coats? I mean, do I even have to ask if you're going to start checking? It's just going to take a ...