1933 Double Eagle ($20 Gold Coin) One of the most famous U.S. coins, this gold piece was never officially circulated. Most were melted down, but a few escaped. One sold at auction for over $18 million in 2021.
1794 Flowing Hair Silver Dollar Believed to be the first silver dollar ever minted by the U.S., this coin symbolizes the birth of American currency. A top-condition example sold for $10+ million.