Collectors find certain dollar bills more interesting than others. I remember the first time I really looked at a dollar bill. I was a kid, and it was like holding a piece of history in my hands.

A printing error may result in thousands of US citizens sitting on six figures if they have a rare dollar bill.

Artist Dan Tague has found hidden messages encrypted in U.S. dollar bills. He would fold a dollar bill as many as 100 times to come up with phrases made up by the letters on the money. Tague's ...