You can call it a C-note, a Benjamin, a Franklin, or a Ben, but no matter what nickname you give it, a 100-dollar bill is always worth at least $100. In some cases, though, super rare 100-dollar bills ...

A twenty doesn't buy what it used to, but some rare 20-dollar bills can actually be worth a lot. Knowing what to look for can help you spot a bill that's special (and could be worth more than your car ...