If you’ve got a few dollar bills in your wallet, you might want to inspect the greenbacks before you spend them. Some U.S.

Do You Have One? There are an estimated six million pairs of the bills currently in circulation, though only nine pairs have ...

One other fun fact about $1 bills: They were the first U.S. currency to feature the motto, “In God We Trust.” Here’s a look at 12 of the most valuable $1 bills, according to CoinValueLookup.