The wonderfully painted rock juts up out of the ground along a wooded road in Marlborough, Connecticut. Not only are the roadside wonder’s origins a mystery, but its form remains a question as well: Most call it Snake Rock, but some refer to it as Turtle Rock, insisting that the small clumps of stones on either side are meant to be clawed feet. No one seems to know the identity of the artist who painted the rock. But a local history website lists it as a landmark, and everyone in…
