Those people you see combing the beach with metal detectors, or guesting on Antique Roadshow, may claim to have an interest in old coins or collectibles. Let's face it though - they're secretly hoping to get rich. But ancient treasure and rare valuables are found through sheer accident or happenstance as often as they are dug up, traded or bartered for. Here are 5 of the most incredible treasures ever discovered by accident. Let's begin!