In the mid 1920s to the mid 1930s, the United States made large denomination bills. They had the $500, $1000, $5000, $10000, and $100000 bill. The $100,000 bill is said to be worth over $1.6 million today. Here is a great article from Yahoo on this.
Money Fair Showcases $100,000 Bills, Rare Coins
Money Fair Showcases $100,000 Bills, Rare Coins