Suggestive aerial views - Nashawena Island

The Elizabeth Islands are private islands between the Cape and the Vineyard  -  a chain of islands ending at Cuttyhunk which is public. I assume boats have been sailing though Vineyard sound, along this coastline, ever since they invented boats. I would expect to see landmarks of some kind.

Here is a bit of the east coast of one of the islands, Nashawena. One sees a couple interesting things if you zoom in (right click and open in new tab).