The $20 bill is the most copied, passed and counterfeited of all American money. It has the most bells and whistles in the printing to prevent passing fake twenties. There has been debate over how long "money" has been around.

Believe it or not, it's been around since the colonial times. Many people believe there was still trading going on, and there was, because only people who were rich used paper money for trading.

The San Francisco Federal Reserve and Doug Mudd, the curator of The American Numismatic Association's Money Museum, have  the history of the $20 bill, from the colonial era to the present.

Finance Yahoo! was able to find $20 notes from every era of the country's banking history, from the colonial era to the present Federal Reserve system. They also included Confederate bills and notes issued by obscure local banks.

To follow the history click here