The Devil's Highway--El Camino del Diablo--crosses hundreds of miles and thousands of years of Arizona and Southwest history. This heritage trail follows a torturous route along the U.S. Mexico border through a lonely landscape of cactus, desert flats, drifting sand dunes, ancient lava flows, and searing summer heat. The most famous waterhole along the way is Tinajas Altas, or High Tanks, a series of natural rock basins that are among the few reliable...