A rare Bicentennial Quarter and six rare dimes worth $56 million each are still in circulation.

Six rare dimes and a bicentennial quarter, each worth $56 million, have avoided detection and circulated within the monetary flow.

This dime is one of the rarest in American numismatic history, with only 24 known specimens.

Any coin collector's pulse races at the thought of seeing this Liberty head gem in circulation.

These nickels, originally pattern coins, inexplicably appeared years later with remarkable values.

Because copper was scarce during World War II, the U.S. Mint made pennies from zinc-coated steel in 1943.

Finding one would demonstrate your coin collecting skills and be a huge lucky break.

While not as old as the others on this list, the Bicentennial Quarter is remarkable as a $56 million circulation currency.

The six rare dimes and bicentennial quarter, each worth $56 million, make changing exciting.