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

The cost to produce a coin and its assigned face value don't necessarily line up, especially in the case of the lowest-value ...

The stock price has surged more than sevenfold over the past two years, and today, it topped the charts as the world's most valuable company in terms of market cap. The stock was up as much as 4.7 ...