A 10-dollar bill wasn't always the size it is today. Older bills, sometimes called "horse blankets," were quite a bit bigger. These large notes measured about 7.42 by 3.1 inches.

New $5 and $10 Bills Linda talks to Bill Buckholz, owner of Goodman Vending Service in Reading Pennsylvania, about problems the new five and ten dollar bills are causing for vending machine owners.

Though there are currently over 2.3 billion $10 bills in circulation, according to the U.S. Federal Reserve, some rare examples could be worth more than their intrinsic value.