Keep your eye out for some rare coins that could be worth millions and millions of dollars.

Nobody knows how many of these coins are in circulation.

The most expensive coin collection ever assembled numbers 15,000 coins—it’s so large and historically thorough that it’s being sold in a series of 15 auctions set to spread out over three years.

Nothing says "rich" in a cartoon quite like having a bag of gold coins. However, if you want to turn this animated fantasy of riches into reality, you might have to go digging through your coin ...