If you grew up in the 1990s or early 2000s, you probably remember collecting state quarters at some point. There were even cardboard maps in the shape of the U.S. where you could pop your latest finds into. And if you found a shinier or more interesting version of one you already had, you could swap it out.
But did you know that some of those state quarters are actually worth money now? These are mostly ones with tiny discrepancies, like minting errors or doubled-die versions. Some coins — like 90% silver proofs — are worth even more.
