Some of the most valuable coins in the world include the 1794-1795 "Flowing Hair Silver/Copper Dollar," the 1933 "Double Eagle" and the 1907 "Saint-Gaudens Double Eagle," according to Mental Floss. As of 2013, each of these coins is valued at over $7 million. The three coins are all of American origin.
Valued at around $10 million, the "Flowing Hair Silver/Copper Dollar" was the first $1 coin issued by the U.S. federal government. Composed of 10 percent copper and 90 percent silver, this coin was minted by the newly formed U.S. Mint in 1794 and 1795. It is one of the most valuable coins in existence.
The 1933 "Double Eagle" gold coin was minted in limited quantities but was never actually released to the public. Then-president Franklin D. Roosevelt banned the ownership of anything gold in 1933 in an attempt to stabilize the banking crisis and end the Great Depression. Twenty of the coins slipped past the restriction, making the "Double Eagle" worth around $7.6 million as of 2013.
The "Saint-Gaudens Double Eagle" is another coin that owes its value to historical circumstance. When Augustus Saint-Gaudens' design proved too complex for the U.S. Mint, chief engraver Charles Barber simplified it by removing the words "In God We Trust." Congressional outcry quickly led to the coin's removal from the market, making this rare coin worth around $7.4 million as of 2013.