In the summer of 2004 a guest named Gary, a self-professed "dumpster diver," came to the ROADSHOW event in Reno, Nevada, with a beaten-up old print he said he'd found among trash gathered from a vacated house.

He decided to hold on to it, and after showing it to appraiser Christopher Lane, Gary was pleased to learn that the 1820 print, made from an iconic work by American painter John Trumbull, had historical significance in addition to its value of $800 to $900. [Watch the appraisal]