The Winnipesaukee Mystery Stone was discovered in 1872 by construction workers hired by Seneca A. Ladd. An egg-shaped relic that looks Native American in origin, no one could really solve what it was or where it had come from. Many other egg-shaped relics like it have been found across the world, but this is the first found in North America. Of the most mysterious parts of it are the holes on the sides like someone bored them out with a power tool. While many theories exist, few of them really solve the mystery surrounding it.