Add Yahoo as a preferred source to see more of our stories on Google. FlamingPumpkin / E+ via Getty Images Many postcards sold for a few cents (or even a penny) when they were first made, but they’re ...

If you've ever come across an old postcard tucked away in a drawer or attic, you might be sitting on a surprising treasure. Not all vintage postcards look valuable at first glance, but some hidden ...

In the prehistoric era that predated Twitter, Facebook and Gmail, the most common form of personal communication was a primitive device called a postcard. "The most efficient means today of letting ...