We had read in a book about NH that Bellows Falls on the eastern edge of Vermont on the Connecticut River is where you can see two ancient continents coming together. NH's geology was from one continent and VT's from another, though now I can find nothing on the internet about this.
Anyway, Sunday last we set off to explore and have lunch in Bellows Falls. The map said there was a welcome center but it wasn't opened. We did manage to find the gorge and the bridge that is closed from VT to NH.
There are supposed to be petroglyphs here. We didn't see them.
Here's a photo from the internet. And here's more information about them HERE.