Yesterday we did the tourist thing and went out to Lexington/Concord where the "shot heard around the world" was fired.  It was very interesting and I had never been there before, despite living within about 20 miles of the place.  The British fired the first shots at Lexington but it was at the bridge at Concord where the Americans actually engaged them.

Here's the bridge with the famous statue of the Minute Man.

We also stopped at Walden Pond and visited the site where Henry David Thoreau spent two years in a one room cabin.  We hiked through the woods for 20 minutes to find the "site" of the cabin, which is now just a spot on the ground surrounded by stone markers.  After hiking back, we found the "replica" cabin and statue of old Henry himself.