While thru-hiking the Appalachian Trail, Robert Moor began to wonder about the paths that lie beneath our feet: Over the course of seven years, Moor traveled the globe, exploring trails of all kinds, from the miniscule to the massive. He learned the tricks of master trail-builders, hunted down long-lost Cherokee trails, and traced the origins of our road networks and the Internet. In each chapter, Moor interweaves his adventures with findings from science, history, philosophy, and nature writing. Throughout, Moor reveals how this single topic—the oft-overlooked trail—sheds new light on a wealth of age-old questions: How does order emerge out of chaos? How did animals first crawl forth from the seas and spread across continents? How has humanity’s relationship with nature and technology shaped world around us? And, ultimately, how does each of us pick a path through life? Moor has the essayist’s gift for making new connections, the adventurer’s love for paths untaken, and the philosopher’s knack for asking big questions. With a breathtaking arc that spans from the dawn of animal life to the digital era, is a book that makes us see our world, our history, our species, and our ways of life anew.