Ancient CivilizationsGroundbreaking discovery at ‘underwater Stonehenge’ in Lake Michigan rewrites human history Posted on July 28, 2025 by Administrator A mysterious, Stonehenge-like structure beneath Lake Michigan has revealed new clues that could reshape our understanding of early human history in North America. Discovered in 2007, the 9,000-year-old site lies 40 feet below the surface of Grand Traverse Bay and features large stones arranged in a line culminating in a hexagon, near a boulder bearing what was long suspected to be an animal carving. Now, nearly two decades later, scientists have confirmed that carving to be a mastodon, an Ice Age species that went extinct more than 11,000 years ago.
