Concord is surely ground zero for Thoreau commemorations. But we all can touch a little bit of the Thoreau legacy simply by talking a walk. Or reading pioneering works such as “Walden,” “Civil Disobedience,” or his essay about his favorite activity, “Walking.”

My moment with Thoreau came this summer when I picked up a book published two decades ago that featured “Walden” in the title, “Walking Toward Walden” by John Hanson Mitchell. An ambitious intellectual project based on a physical challenge, the book attempted to evoke not only what Thoreau’s neighborhood was like back when he used to take daily walks in the woods outside of Concord, but also what it is like today — along with a fair representation of the Concord region before Europeans arrived in North America and in all the intervening eras since.

Here is Mitchell’s take on the centrality of Concord and its role in Thoreau’s universe. “Drawn by the charismatic Ralph Waldo Emerson, who returned to his ancestral territory to live in 1834, other writers or thinkers began to visit or even settle in Concord so that by 1840, this small satellite of Cambridge and Boston had become the American center of intellectual activity.”

Nathaniel Hawthorne, who referred to Concord as “Eden,” moved there in 1842, Bronson Alcott in 1848. Louisa May Alcott made the place a setting for “Little Women,” a pioneering publishing success. The poet Ellery Channing dwelled there. Feminist educator Margaret Fuller visited often to help prime the Transcendentalist pump.

As for our famous prophet of simple living and love of nature, Mitchell describes him as “the sometime schoolteacher, pencil maker, surveyor and handyman named Henry Thoreau, whose oeuvre was all but unread until after his death in 1862.”

Books about Thoreau are many. Books about walking his land are rare.

When John Hanson Mitchell and his two eccentrically learned friends and traveling companions set out to walk from Westford, Mass. to Concord entirely through undeveloped land — in one day — the literary adventure goes forward but also backwards, with many frequent side trips into the major interests of the three hikers, their previous ventures together, and some references to their separate adventures as well. One of his companions knows everything about birds. The other knows — almost everything — about Native Americans. Mitchell knows Concords backwards and forwards and provides a mean recreation of the Revolution-sparking Battle of Lexington and Concord as well.

Given that range of expertise, the book hangs together because of its concentration on to the unifying concept that was also at the center of Thoreau’s life and thinking, namely “the land.”

Their single-day trek through land preserves, near impassable wetlands, over high bridges, through the backyards of new housing developments, and along dirt paths that once served long-gone farmsteads, succeeds in evoking a sense, however speculative, of what walking the land meant for Thoreau. We also learn what our contemporary three-some discover about the much-changed, much varied, and still-changing Concord region’s landscape. But even Thoreau himself was “passing through time” — that’s the way I’ve decided to think about it — when he walked the surrounds of beloved mid-19th century “Transcendentalist” Concord because the changes wrought by the European civilization planted there were already evident.

The Colonial farms of an earlier day were being abandoned in Thoreau’s time. Farmlands that had been claimed from the wilderness at great cost — certainly in time and energy — in the 17th and 18th centuries had already been ‘farmed out’ by European methods. Their owners had headed west to find new lands to exploit, and the land left behind was going back (or had already gone back) to the wild. The abandoned fields were still far from the largely undisturbed old forest of the indigenous peoples displaced by the Europeans, but lots of land around Concord was heading in that direction. And in some parts of Mitchell’s journey, the same processes could be observed.

In fact, pieces the landscape continue to go back and forth between development and reforestation. The book’s three travelers encounter shopping centers, factories, warehouses, railyards, technology think-tanks and corporate centers along Route 128 (“technology highway”). They pass through suburban subdivisions, protected wildlands with conservation restrictions in perpetuity, dried riverbeds and new wetlands. The beavers that disappeared before Thoreau’s time have now returned. As we know, more clearly than 20 years ago, deer are everywhere today.

Thoreau observed the landscape changes of his own day, while celebrating what endures. What else Thoreau discovered on his daily walks includes — almost everything. Here’s how his famous essay “Walking” was described when it first appeared in the Atlantic Monthly in 1862. The author “explores: the joys and necessities of long afternoon walks; how spending time in untrammeled fields and woods soothes the spirit; how Nature guides us on our walks; the lure of the wild for writers and artists; and why ‘all good things are wild and free.’”

(The essay is available today as a 60-page paperback. See https://www.goodreads.com/book/show/227113.Walking)

Just reading words such as these makes me sad to realize that I cannot today leave my door and achieve by foot in any reasonable time frame “the lure of the wild.” I suspect that even on my best days I could not have kept pace with Thoreau’s habitual walks.

How much philosophical weight Thoreau put on walking can be seen in statements such as these from his essay “Walking.”