South of the border, a spectacular range of ancient volcanoes rises from the desert floor just a few miles from the Sea of Cortez. Virtually untraveled, the Sierra Pinacate in northwestern Mexico beckons adventurers and scientists. Here, in words and pictures, is a remarkable introduction to this place of almost surreal beauty. Sometimes veiled in clouds or dust storms, the Pinacate have long been shrouded in mystery as well. From prehistoric times until today, people of Sonora have told tales of giants, men and animals, bottomless pits, endless tunnels, hostile Indians, smoking...