I was traveling on US 52 between, I think it was, Minot and Portal, this past summer. I observered what appears to be white rocks formed to show, what look like, years on the hills along the highway. There were a number of years represented. It's unique and looks like a tradition, so, I was wondering what these were all about.
I would appriciate any information.
Thanks in advance,
A Traveler
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