The dollar may not go as far as it used to, but it's still an important currency. (Dollar pizza slices, anyone?) On that note, Here are five cool facts about the dollar bill in honor of National Dollar Day, which always falls on August 8 to celebrate Congress establishing the U.S. monetary system in 1786.

1. The eye at the top of the pyramid is said to either be the eye of God, or the Illuminati eye. Some people believe that America's Founding Fathers were Freemason's, and the all-seeing eye is one of their symbols. 

2. At the bottom of the pyramid are the roman numerals MDCCLXXVI which reads '1776', the year of American independence. 

3. The eagle on the back of the bill holds 13 arrows and an olive branch with 13 leaves and 13 olives. The shield also respectively has 13 horizontal and vertical stripes. This all stands for the original 13 colonies. 

4. American currency isn't all paper, but 75 percent cotton and 25 percent linen, according to the Bureau of Engraving and Printing.

5. Ruined money? As long as you have three-quarters of the bill, it should still be legal tender.