It's everybody's dream to suddenly find a rare coin floating around in their pocket or purse and be an instant millionaire, and although that's always possible (not all the rare coins in the world are accounted for) it's pretty unlikely. Coin collecting is big business, both as a hobby and as a way to turn a profit. As a general rule the more rare a coin is the more it's worth, so what's the rarest coin ever? It's a debatable subject as not all experts always agree, but if the Double Eagle isn't at the top of that list it's sure near it. Back in 2002 the only Double Eagle coin left to be in private hands (or so everybody thought) sold for $7.9 million dollars.

Other rare coins include the Double Eagles smaller cousin the Quarter Eagle, and then the Brasher Doubloon, and the Eagle. More for fun then there's always the world's biggest coin, valued at $2 million+ (it's weights over 220 pounds and is the size of a pizza -- that would be a fun delivery!).

Good luck searching those pockets!