If you want to invest in the world's most valuable coins, you'd better be ready to pony up some serious cash. The priciest coins fetch millions of dollars at auction, and even less expensive ...

Many different metals have been used as money, including copper, iron, tin, gold, and silver. Metal money can be melted down and used for other purposes, which makes it an appealing form of payment.

There might be a treasure in your family’s attic. Not the fairy tale treasure with a leprechaun or a fairy winking at you ...