Finding hidden treasure can be a once-in-a-lifetime occurrence that can bring glory, and often riches too. But sometimes finders isn't keepers. From the homeowners that found a treasure in the walls of their new home to the metal detectorists who hid a Viking hoard from the authorities, these treasure-hunters – or sometimes treasure thieves – didn't get to hold onto their finds for long. Read on to see some of the valuable treasures that their finders were forced to hand back.