I’m with mgraf68: You’re going to have to find these places on your own, because I am terrified of them becoming more over run with people than they are. And some remain startlingly and breathtakingly isolated from human intrusion. I think it’s rude and destructive, intrusive, to ask people to identify and list these sacred places. Perhaps it is better to spur conversation about how individuals find those places, what they mean… and how they can be protected.
Michigan’s, and the Great Lakes’ in general, secret places are special for that very reason: they are secret, often hard to get to… or are on the cusp of being ruined in much the same way the remoteness of Pictured Rocks National Lakeshore was ruined when they paved H48… now you can hear the whine of motorcycles in places where once the only thing you could hear was Lake Superior, wind and birds. I keep them close to my chest and am terrified that one might appear on a list like this one.
One secret of secret places is to go when no one else does… or to walk away from a parking lot or paved trail, often no more than a half mile. There’s a state park not far from where I live that is inundated by people for two months of the year, but delightfully abandoned for much of the rest. I’ve also worked hard to make my own backyard one of those sacred regenerative places.
I think museums also serve that function.