Lake Michigan Stonehenge!?!?

An underwater archaeologist has stumbled on a Stonehenge-like arrangement of ancient stones.

An ancient mini-Stonehenge stands underwater in Grand Traverse Bay, part of Lake Michigan. 

Looking for shipwrecks in this area, which was a busy 19th- and 20th-century maritime trade route, Mark Holley, professor of underwater archaeology at Northwestern Michigan University, first came across a rock that he said bears a prehistoric carving of a mastodon. On further investigation, he discovered a Stonehenge-like arrangement of ancient stones.