When I was a kid, I saw Native American drawings in a small cave on an uninhabited island off the Maine coast near my grandparents place. I was exploring the rocks and climbing around. When I got back to the older people they didn't seem to really believe me. For years I would tell people what I saw but nobody took it seriously, and when we went back to the island, I couldn't find the cave.
Fast forward 40 years. I just read a brief history of coastal Maine, an old book from the 1920's. It mentioned Indian rock drawings being discovered along the coast and islands!
Victory is mine!