A coin can be worth a ton of money -- a pretty penny, one might say -- if it's rare and has enough historical significance.

1943 Lincoln Head Copper Penny – According to a U.S. Mint press release, this rare coin is one of the most coveted among collectors ... Today, there exists 11 to 15 in collectors’ hands. 1838-O Capped ...

Very few countries still mint silver coins, and those that do make them almost exclusively for collectors and investors.

With their former countrymen divided and lacking a monarch after the English Civil War, Colonists seized an opportunity to ...