The author, John Buchan, maintains that "the main lines of the earth's architecture have been determined" during the first two decades of the twentieth century, and all that remains is but "amplifying our knowledge of the groyning and buttresses and stone-work." In this history of exploration, he tells of nine of those momentous final discoveries that placed the earth's last big secrets firmly on the map, from the mysterious "cloud city" of Lhasa, to the slopes--but not yet the summit--of Mount Everest.