Once known as the “Hobby of the Kings,” coin collecting is a global pastime open to anyone with an appetite for accumulation.

You probably remember when collecting state quarters felt like a nationwide treasure hunt. Maybe you saved them in those cardboard folders or tossed them into a jar with dreams of future value. The ...

You might think a quarter is just 25 cents. Most of the time, that's exactly right. Yet hiding in circulation, in your change jar, or even inside that old coffee can your grandparents used to save ...