In a world so big and old and full of great deeds as this, it is extremely difficult to say of any one man, "He was the greatest" this or that; and even in the matter of journeys there have been bewilderingly many great ones, of the most wonderful of which we have heard least. As explorers we cannot give Vaca and Docampo great rank; though the latter's explorations were not contemptible, and Vaca's were of great importance. But as physical achievements the journeys of these neglected heroes can safely be said to be without parallel. They were the most wonderful walks ever made by man. Both men made their records in America, and each made most of his journey in what is now the United States. Cabeza de Vaca was the first European really to penetrate the then "Dark Continent" of North America, as he was by centuries the first to _cross_ the continent. His nine years of wandering on foot, unarmed, naked, starving, among wild beasts and wilder men, with no other attendants than three as ill-fated comrades, gave the world its first glimpse of the United States inland, and led to some of the most stirring and important achievements connected with its early history. Nearly a century before the Pilgrim Fathers planted their noble commonwealth on the edge of Massachusetts, seventy-five years before the first English settlement was made in the New World, and more than a generation before there was a single Caucasian settler of _any_ blood within the area of the present United States, Vaca and his gaunt followers had trudged across this unknown land. It is a long way back to those days. Henry VIII. was then king of England, and sixteen rulers have since occupied that throne. Elizabeth, the Virgin Queen, was not born when Vaca started on his appalling journey, and did not begin to reign until twenty years after he had ended it. It was fifty years before the birth of Captain John Smith, the founder of Virginia; a generation before the birth of Shakspere, and two and a half generations before Milton. Henry Hudson, the famous explorer for whom one of our chief rivers is named, was not yet born. Columbus himself had been dead less than twenty-five years, and the conqueror of Mexico had seventeen yet to live. It was sixty years before the world had heard of such a thing as a newspaper, and the best geographers still thought it possible to sail through America to Asia. There was not a white man in North America above the middle of Mexico; nor had one gone two hundred miles inland in this continental wilderness, of which the world knew almost less than we know now of the moon.