It was a time before Terlingua Ranch and chili cook-offs, and you could drive a hundred miles without seeing another vehicle or another person. The year was 1961, and the tides of humanity which ebbed and flowed into the lower reaches of the Big Bend were at their historical nadir. It was a vast, empty land spotted by isolated ranch headquarters, a national park with few visitors, and the many ruins of a past shrouded in legend, lore, and improbable...