Hidden-Treasure Facts

Karl Kissner was cleaning out his late grandfather's attic in Defiance, Ohio when he found a dusty box. Inside were roughly 700 baseball cards from 1910 - including 16 Ty Cobbs and a Honus Wagner - in near-perfect condition, untouched for a century. The collection was valued at $3 million.

A Virginia woman bought a napkin-sized landscape at a West Virginia flea market in 2009 for $7. She wanted the plastic cow and the doll in the same box. Two years later she learned the little painting was a genuine Renoir worth $100,000. Then the FBI showed up. The museum had reported it missing in 1951.