American paper currency has taken many forms over the years. Have you ever wondered what the largest denomination of money is, and who's on it? And what the pictures are on the back of the different bills? What is the meaning of the eye and the pyramid?
Click on any of the bills below, and you'll learn lots of interesting things about U.S. money - like how many times can you fold a bill before it falls apart, and how long the average bill lasts before it is destroyed and replaced.