A 1907 $10 coin is now worth $2.4 million. It's one of the great rarities of American coin collecting. Read about it here.

A 1933 Double Eagle, initially minted for circulation, became the world's most expensive coin, selling for $18.9 million.

There's a marketplace for coin enthusiasts to buy and sell rare coins, where you could make some decent money if you find one that's in demand.

The coin features Ferdinand III of Habsburg. (Numismatica Ars Clas via SWNS) By James Gamble A gold coin that had to be hidden from the Nazis is set to become the most expensive ever sold with an ...

As with just about any asset, a coin’s value is determined by its market demand. This means that coins in short supply often see higher demand — and higher values. With coins, supplies are limited ...