Drawing on rarely examined diaries and journals, Down the Great Unknown is the first book to tell the full, dramatic story of the Powell expedition. On May 24, 1869 a one-armed Civil War veteran, John Wesley Powell and a ragtag band of nine mountain men embarked on the last great quest in the American West. The Grand Canyon, not explored before, was as mysterious as Atlantis—and as perilous. The ten men set out from Green River Station, Wyoming Territory down the Colorado in four wooden rowboats. Ninety-nine days later, six half-starved wretches came ashore near Callville, Arizona. Lewis and Clark opened the West in 1803, six decades later Powell and his scruffy band aimed to resolve the West’s last mystery. A brilliant narrative, a thrilling journey, a cast of memorable heroes—all these mark Down the Great Unknown, the true story of the last epic adventure on American soil.

The epic story of the fastest boat ride in history, on a hand-built dory named the "Emerald Mile," through the heart of the Grand Canyon on the Colorado river.

By 1869, the map of the United States had long since been filled in. Only one mystery remained; an immense area of the south-west, larger than any state in the union and any country in Europe, remained unexplored.

One hundred years ago John Wesley Powell set out to explore the Grand Canyon of the Colorado - something no man had attempted before. His official report of the voyage remains one of the great adventure stories in all the literature of the American West.

This text is a magisterial account of John Wesley Powell, the great American explorer and environmental pioneer. It tells the true story of undaunted courage in the American West.

“An engaging voyage into some of the great mysteries and wonders of our world." --Alan Lightman, author of Einstein’s Dream and The Accidental Universe “No one is better at making the recondite accessible and exciting.” —Bill Bryson Brain Pickings and Kirkus Best Science Book of the Year Every week seems to throw up a new discovery, shaking the foundations of what we know. But are there questions we will never be able to answer—mysteries that lie beyond the predictive powers of science? In this captivating exploration of our most tantalizing unknowns, Marcus du Sautoy invites us to consider the problems in cosmology, quantum physics, mathematics, and neuroscience that continue to bedevil scientists and creative thinkers who are at the forefront of their fields. At once exhilarating, mind-bending, and compulsively readable, The Great Unknown challenges us to consider big questions—about the nature of consciousness, what came before the big bang, and what lies beyond our horizons—while taking us on a virtuoso tour of the great breakthroughs of the past and celebrating the men and women who dared to tackle the seemingly impossible and had the imagination to come up with new ways of seeing the world.

John Wesley Powell’s 1869 expedition down the Green and Colorado Rivers and through the Grand Canyon continues to be one of the most celebrated adventures in American history, ranking with the Lewis and Clark expedition and the Apollo landings on the moon. For nearly twenty years Lago has researched the Powell expedition from new angles, traveled to thirteen states, and looked into archives and other sources no one else has searched. He has come up with many important new documents that change and expand our basic understanding of the expedition by looking into Powell’s crewmembers, some of whom have been almost entirely ignored by Powell historians. Historians tended to assume that Powell was the whole story and that his crewmembers were irrelevant. More seriously, because several crew members made critical comments about Powell and his leadership, historians who admired Powell were eager to ignore and discredit them. Lago offers a feast of new and important material about the river trip, and it will significantly rewrite the story of Powell’s famous expedition. This book is not only a major work on the Powell expedition, but on the history of American exploration of the West.

In 1869 one-armed Civil War veteran John Wesley Powell led an expedition down the treacherous waters of the Green and Colorado Rivers to map America's last uncharted wilderness.