But this article by Steven Johnson will give you much more to chew on: The Thinking Path.
A few years after Charles Darwin moved into Down House, the three-story home in the suburbs of London where he lived with his family for the last forty years of his life, he leased an adjoining strip of land from a neighbor and constructed a gravel path that ran alongside its periphery. Over the years he planted gardens and trees to accompany the oak grove already on the property, which he came to call “Sandwalk Grove.” Almost every day, he walked multiple loops on the path, working through the grand theory of evolution that he developed over the decades at Down House. Today, visitors to the property can retrace Darwin’s steps on what is formally called “the sandwalk,” though Darwin himself gave it another name. He called it his “thinking path.”
Scenes from today’s walk at French Regional Park.