Paper currency in America has a vast and complex history. Its various banknotes, limited editions, and errors have fascinated collectors and money dealers for centuries - and inspired not a few artists.
From the rarity of a banknote to the image on the face of the bill to the story behind why the legal tender is no longer in circulation, there are so many factors that can influence the value of paper money. Here's a look at some of the rare notes that are now worth a whole lot of cash - if you happen to find them lying around in an old attic or at the back of a thrift store.
Note: It's important to remember that the values listed below reflect bills that are in mint condition, or as close to uncirculated condition as possible.
1890 $1,000 'Grand Watermelon' Treasury Note
1890 $100 'Baby Watermelon' Treasury Note
1928 $500 Star Symbol Note
1918 Alexander Hamilton $1,000 Banknote
1928 $1,000 Bill
1993 $20 Federal Reserve Note MisprintPhoto: Ebay