Just outside of Concord, Walden Pond offers a famously serene environment that’s still replete with swimming, hiking, canoeing, rowing and, of course, the historic Henry David Thoreau cabin site.

The Old North Bridge on the Concord River has seen a lot of changes to the climate, but cannot tell them, unlike Thoreau's journal. - Image credit: Conny Pokorny/Shutterstock.com© IFL Science ...

The struggle on the Old North Bridge over the Concord River at the Battle of Concord, on the first day of battle in the American Revolutionary War, April 19, 1775. Getty Images ...

The last leg of the trip has him going back to the Concord River and to Route 225. The event ends at the Bedford boat ramp. A good friend will run a support camp on the island with water and hot food.

The Grove In addition to the trees along the Concord River depicted in the 1825 and 1832 maps, another substantial stand of trees existed due west on the other side of the hill (and just south of the ...